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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdlib.h>
  4.  
  5. int countOccurrence(char* sen,char* word)
  6. {
  7. 	int count=0,i,k,len1,len2;
  8.  
  9. 	len1=strlen(sen);
  10. 	len2=strlen(word);
  11. 	for(i=0;i<len1-len2+1;)
  12. 	{
  13. 		k=0;
  14. 		while(word[k] && sen[k+i]==word[k])
  15. 			k++;
  16. 		if(k==len2 && sen[k+i]==' ' || sen[k+i]=='\0')
  17. 		{
  18. 			count++;
  19. 			i+=len2;
  20. 		}
  21. 		else ++i;
  22. 	}
  23. 	return count;
  24. }
  25.  
  26. void replace(char* sen,char* oldword,char* newword)
  27. {
  28. 	int count,len1,len2,len3,i,top=-1,k;
  29. 	char *ptr;
  30.  
  31. 	count=countOccurrence(sen,oldword);
  32.  
  33. 	if(!count) return;
  34.  
  35. 	len1=strlen(sen);
  36. 	len2=strlen(oldword);
  37. 	len3=strlen(newword);
  38.  
  39. 	ptr=(char*)malloc(sizeof(len1+count*(len3-len2)+1));
  40.  
  41. 	for(i=0;i<len1-len2+1;)
  42. 	{
  43. 		k=0;
  44. 		while(oldword[k] && sen[k+i]==oldword[k])
  45. 			k++;
  46. 		if(k==len2 && sen[k+i]==' ' || sen[k+i]=='\0')
  47. 		{
  48. 			for(k=0;newword[k];++k)
  49. 				ptr[++top]=newword[k];
  50. 			i+=len2;
  51. 		}
  52. 		else
  53. 		{
  54. 			ptr[++top]=sen[i];
  55. 			++i;
  56. 		}
  57. 	}	
  58. 	ptr[++top]='\0';
  59.  
  60. 	strcpy(sen,ptr);
  61. 	free(ptr);
  62. }
  63.  
  64. int main()
  65. {
  66. 	char sen[50],oldword[10],newword[10];
  67.  
  68. 	fgets(sen,50,stdin);
  69. 	fgets(oldword,10,stdin);
  70. 	fgets(newword,10,stdin);
  71.  
  72. 	replace(sen,oldword,newword);
  73.  
  74. 	printf("Modified string:\n%s",sen);
  75.  
  76. 	return 0;
  77. }
  78.  
Runtime error #stdin #stdout 0.01s 2932KB
comments ()
stdin
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Hyderabad is bad
bad
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stdout
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Standard output is empty
https://ideone.com/mh3X1
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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