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  1. #include<stdio.h>
  2.  
  3. #include<conio.h>
  4.  
  5. #include<stdlib.h>
  6.  
  7. #include<math.h>
  8.  
  9. #include<string.h>
  10.  
  11. long int p,q,n,t,flag,e[100],d[100],temp[100],j,m[100],en[100],i;
  12.  
  13. char msg[100];
  14.  
  15. int prime(long int);
  16.  
  17. void ce();
  18.  
  19. long int cd(long int);
  20.  
  21. void encrypt();
  22.  
  23. void decrypt();
  24.  
  25. void main() {
  26.  
  27. 	clrscr();
  28.  
  29. 	printf("\nENTER FIRST PRIME NUMBER\n");
  30.  
  31. 	scanf("%d",&p);
  32.  
  33. 	flag=prime(p);
  34.  
  35. 	if(flag==0) {
  36.  
  37. 		printf("\nWRONG INPUT\n");
  38.  
  39. 		getch();
  40.  
  41. 		exit(1);
  42.  
  43. 	}
  44.  
  45. 	printf("\nENTER ANOTHER PRIME NUMBER\n");
  46.  
  47. 	scanf("%d",&q);
  48.  
  49. 	flag=prime(q);
  50.  
  51. 	if(flag==0||p==q) {
  52.  
  53. 		printf("\nWRONG INPUT\n");
  54.  
  55. 		getch();
  56.  
  57. 		exit(1);
  58.  
  59. 	}
  60.  
  61. 	printf("\nENTER MESSAGE\n");
  62.  
  63. 	fflush(stdin);
  64.  
  65. 	scanf("%s",msg);
  66.  
  67. 	for (i=0;msg[i]!=NULL;i++)
  68.  
  69. 	m[i]=msg[i];
  70.  
  71. 	n=p*q;
  72.  
  73. 	t=(p-1)*(q-1);
  74.  
  75. 	ce();
  76.  
  77. 	printf("\nPOSSIBLE VALUES OF e AND d ARE\n");
  78.  
  79. 	for (i=0;i<j-1;i++)
  80.  
  81. 	printf("\n%ld\t%ld",e[i],d[i]);
  82.  
  83. 	encrypt();
  84.  
  85. 	decrypt();
  86.  
  87. 	getch();
  88.  
  89. }
  90.  
  91. int prime(long int pr) {
  92.  
  93. 	int i;
  94.  
  95. 	j=sqrt(pr);
  96.  
  97. 	for (i=2;i<=j;i++) {
  98.  
  99. 		if(pr%i==0)
  100.  
  101. 		    return 0;
  102.  
  103. 	}
  104.  
  105. 	return 1;
  106.  
  107. }
  108.  
  109. void ce() {
  110.  
  111. 	int k;
  112.  
  113. 	k=0;
  114.  
  115. 	for (i=2;i<t;i++) {
  116.  
  117. 		if(t%i==0)
  118.  
  119. 		    continue;
  120.  
  121. 		flag=prime(i);
  122.  
  123. 		if(flag==1&&i!=p&&i!=q) {
  124.  
  125. 			e[k]=i;
  126.  
  127. 			flag=cd(e[k]);
  128.  
  129. 			if(flag>0) {
  130.  
  131. 				d[k]=flag;
  132.  
  133. 				k++;
  134.  
  135. 			}
  136.  
  137. 			if(k==99)
  138.  
  139. 			        break;
  140.  
  141. 		}
  142.  
  143. 	}
  144.  
  145. }
  146.  
  147. long int cd(long int x) {
  148.  
  149. 	long int k=1;
  150.  
  151. 	while(1) {
  152.  
  153. 		k=k+t;
  154.  
  155. 		if(k%x==0)
  156.  
  157. 		    return(k/x);
  158.  
  159. 	}
  160.  
  161. }
  162.  
  163. void encrypt() {
  164.  
  165. 	long int pt,ct,key=e[0],k,len;
  166.  
  167. 	i=0;
  168.  
  169. 	len=strlen(msg);
  170.  
  171. 	while(i!=len) {
  172.  
  173. 		pt=m[i];
  174.  
  175. 		pt=pt-96;
  176.  
  177. 		k=1;
  178.  
  179. 		for (j=0;j<key;j++) {
  180.  
  181. 			k=k*pt;
  182.  
  183. 			k=k%n;
  184.  
  185. 		}
  186.  
  187. 		temp[i]=k;
  188.  
  189. 		ct=k+96;
  190.  
  191. 		en[i]=ct;
  192.  
  193. 		i++;
  194.  
  195. 	}
  196.  
  197. 	en[i]=-1;
  198.  
  199. 	printf("\nTHE ENCRYPTED MESSAGE IS\n");
  200.  
  201. 	for (i=0;en[i]!=-1;i++)
  202.  
  203. 	printf("%c",en[i]);
  204.  
  205. }
  206.  
  207. void decrypt() {
  208.  
  209. 	long int pt,ct,key=d[0],k;
  210.  
  211. 	i=0;
  212.  
  213. 	while(en[i]!=-1) {
  214.  
  215. 		ct=temp[i];
  216.  
  217. 		k=1;
  218.  
  219. 		for (j=0;j<key;j++) {
  220.  
  221. 			k=k*ct;
  222.  
  223. 			k=k%n;
  224.  
  225. 		}
  226.  
  227. 		pt=k+96;
  228.  
  229. 		m[i]=pt;
  230.  
  231. 		i++;
  232.  
  233. 	}
  234.  
  235. 	m[i]=-1;
  236.  
  237. 	printf("\nTHE DECRYPTED MESSAGE IS\n");
  238.  
  239. 	for (i=0;m[i]!=-1;i++)
  240.  
  241. 	printf("%c",m[i]);
  242.  
  243. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:1: error: illegal character: '#'
#include<stdio.h>
^
Main.java:1: error: class, interface, or enum expected
#include<stdio.h>
        ^
Main.java:3: error: illegal character: '#'
#include<conio.h>
^
Main.java:5: error: illegal character: '#'
#include<stdlib.h>
^
Main.java:7: error: illegal character: '#'
#include<math.h>
^
Main.java:9: error: illegal character: '#'
#include<string.h>
^
Main.java:13: error: class, interface, or enum expected
char msg[100];
^
Main.java:15: error: class, interface, or enum expected
int prime(long int);
^
Main.java:17: error: class, interface, or enum expected
void ce();
^
Main.java:19: error: class, interface, or enum expected
long int cd(long int);
^
Main.java:21: error: class, interface, or enum expected
void encrypt();
^
Main.java:23: error: class, interface, or enum expected
void decrypt();
^
Main.java:25: error: class, interface, or enum expected
void main() {
^
Main.java:29: error: class, interface, or enum expected
	printf("\nENTER FIRST PRIME NUMBER\n");
	^
Main.java:31: error: class, interface, or enum expected
	scanf("%d",&p);
	^
Main.java:33: error: class, interface, or enum expected
	flag=prime(p);
	^
Main.java:35: error: class, interface, or enum expected
	if(flag==0) {
	^
Main.java:39: error: class, interface, or enum expected
		getch();
		^
Main.java:41: error: class, interface, or enum expected
		exit(1);
		^
Main.java:43: error: class, interface, or enum expected
	}
	^
Main.java:47: error: class, interface, or enum expected
	scanf("%d",&q);
	^
Main.java:49: error: class, interface, or enum expected
	flag=prime(q);
	^
Main.java:51: error: class, interface, or enum expected
	if(flag==0||p==q) {
	^
Main.java:55: error: class, interface, or enum expected
		getch();
		^
Main.java:57: error: class, interface, or enum expected
		exit(1);
		^
Main.java:59: error: class, interface, or enum expected
	}
	^
Main.java:63: error: class, interface, or enum expected
	fflush(stdin);
	^
Main.java:65: error: class, interface, or enum expected
	scanf("%s",msg);
	^
Main.java:67: error: class, interface, or enum expected
	for (i=0;msg[i]!=NULL;i++)
	^
Main.java:67: error: class, interface, or enum expected
	for (i=0;msg[i]!=NULL;i++)
	         ^
Main.java:67: error: class, interface, or enum expected
	for (i=0;msg[i]!=NULL;i++)
	                      ^
Main.java:71: error: class, interface, or enum expected
	n=p*q;
	^
Main.java:73: error: class, interface, or enum expected
	t=(p-1)*(q-1);
	^
Main.java:75: error: class, interface, or enum expected
	ce();
	^
Main.java:77: error: class, interface, or enum expected
	printf("\nPOSSIBLE VALUES OF e AND d ARE\n");
	^
Main.java:79: error: class, interface, or enum expected
	for (i=0;i<j-1;i++)
	^
Main.java:79: error: class, interface, or enum expected
	for (i=0;i<j-1;i++)
	         ^
Main.java:79: error: class, interface, or enum expected
	for (i=0;i<j-1;i++)
	               ^
Main.java:83: error: class, interface, or enum expected
	encrypt();
	^
Main.java:85: error: class, interface, or enum expected
	decrypt();
	^
Main.java:87: error: class, interface, or enum expected
	getch();
	^
Main.java:89: error: class, interface, or enum expected
}
^
Main.java:95: error: class, interface, or enum expected
	j=sqrt(pr);
	^
Main.java:97: error: class, interface, or enum expected
	for (i=2;i<=j;i++) {
	^
Main.java:97: error: class, interface, or enum expected
	for (i=2;i<=j;i++) {
	         ^
Main.java:97: error: class, interface, or enum expected
	for (i=2;i<=j;i++) {
	              ^
Main.java:103: error: class, interface, or enum expected
	}
	^
Main.java:107: error: class, interface, or enum expected
}
^
Main.java:113: error: class, interface, or enum expected
	k=0;
	^
Main.java:115: error: class, interface, or enum expected
	for (i=2;i<t;i++) {
	^
Main.java:115: error: class, interface, or enum expected
	for (i=2;i<t;i++) {
	         ^
Main.java:115: error: class, interface, or enum expected
	for (i=2;i<t;i++) {
	             ^
Main.java:121: error: class, interface, or enum expected
		flag=prime(i);
		^
Main.java:123: error: class, interface, or enum expected
		if(flag==1&&i!=p&&i!=q) {
		^
Main.java:127: error: class, interface, or enum expected
			flag=cd(e[k]);
			^
Main.java:129: error: class, interface, or enum expected
			if(flag>0) {
			^
Main.java:133: error: class, interface, or enum expected
				k++;
				^
Main.java:135: error: class, interface, or enum expected
			}
			^
Main.java:141: error: class, interface, or enum expected
		}
		^
Main.java:151: error: class, interface, or enum expected
	while(1) {
	^
Main.java:155: error: class, interface, or enum expected
		if(k%x==0)
		^
Main.java:159: error: class, interface, or enum expected
	}
	^
Main.java:167: error: class, interface, or enum expected
	i=0;
	^
Main.java:169: error: class, interface, or enum expected
	len=strlen(msg);
	^
Main.java:171: error: class, interface, or enum expected
	while(i!=len) {
	^
Main.java:175: error: class, interface, or enum expected
		pt=pt-96;
		^
Main.java:177: error: class, interface, or enum expected
		k=1;
		^
Main.java:179: error: class, interface, or enum expected
		for (j=0;j<key;j++) {
		^
Main.java:179: error: class, interface, or enum expected
		for (j=0;j<key;j++) {
		         ^
Main.java:179: error: class, interface, or enum expected
		for (j=0;j<key;j++) {
		               ^
Main.java:183: error: class, interface, or enum expected
			k=k%n;
			^
Main.java:185: error: class, interface, or enum expected
		}
		^
Main.java:189: error: class, interface, or enum expected
		ct=k+96;
		^
Main.java:191: error: class, interface, or enum expected
		en[i]=ct;
		^
Main.java:193: error: class, interface, or enum expected
		i++;
		^
Main.java:195: error: class, interface, or enum expected
	}
	^
Main.java:199: error: class, interface, or enum expected
	printf("\nTHE ENCRYPTED MESSAGE IS\n");
	^
Main.java:201: error: class, interface, or enum expected
	for (i=0;en[i]!=-1;i++)
	^
Main.java:201: error: class, interface, or enum expected
	for (i=0;en[i]!=-1;i++)
	         ^
Main.java:201: error: class, interface, or enum expected
	for (i=0;en[i]!=-1;i++)
	                   ^
Main.java:205: error: class, interface, or enum expected
}
^
Main.java:211: error: class, interface, or enum expected
	i=0;
	^
Main.java:213: error: class, interface, or enum expected
	while(en[i]!=-1) {
	^
Main.java:217: error: class, interface, or enum expected
		k=1;
		^
Main.java:219: error: class, interface, or enum expected
		for (j=0;j<key;j++) {
		^
Main.java:219: error: class, interface, or enum expected
		for (j=0;j<key;j++) {
		         ^
Main.java:219: error: class, interface, or enum expected
		for (j=0;j<key;j++) {
		               ^
Main.java:223: error: class, interface, or enum expected
			k=k%n;
			^
Main.java:225: error: class, interface, or enum expected
		}
		^
Main.java:229: error: class, interface, or enum expected
		m[i]=pt;
		^
Main.java:231: error: class, interface, or enum expected
		i++;
		^
Main.java:233: error: class, interface, or enum expected
	}
	^
Main.java:237: error: class, interface, or enum expected
	printf("\nTHE DECRYPTED MESSAGE IS\n");
	^
Main.java:239: error: class, interface, or enum expected
	for (i=0;m[i]!=-1;i++)
	^
Main.java:239: error: class, interface, or enum expected
	for (i=0;m[i]!=-1;i++)
	         ^
Main.java:239: error: class, interface, or enum expected
	for (i=0;m[i]!=-1;i++)
	                  ^
Main.java:243: error: class, interface, or enum expected
}
^
97 errors
stdout
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Standard output is empty
https://ideone.com/1PVbLE
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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