fork download
copy 
  1. #include <stdio.h>
  2. #include <ctype.h>
  3. #include <string.h>
  4.  
  5. // In case you need this -- not needed for this case
  6. void discard_input()
  7. {
  8. 	char c;
  9.  
  10. 	while( ( c = getchar() ) != '\n' && c != EOF );
  11. }
  12.  
  13. void remove_trailing_newline(char * s)
  14. {
  15. 	char * ch = s + strlen( s ) - 1;
  16.  
  17. 	while( ch != s ) {
  18. 		if ( *ch == '\n' ) {
  19. 			*ch = 0;
  20. 			break;
  21. 		}
  22.  
  23. 		--ch;
  24. 	}
  25.  
  26. 	return;
  27. }
  28.  
  29. int main(){
  30.     char name[30];
  31.     char number[12];
  32.     int flag, flag1, flag2, flag3;
  33.     int i;
  34.  
  35.  
  36.     printf("Add New Contact\n");
  37.     do {
  38.  
  39.     printf("\nInput name [1..30 char]: ");
  40.     fgets( name, 30, stdin );
  41.     remove_trailing_newline( name );
  42.     flag1 = flag = 1;
  43.  
  44.         if ( !isalpha( name[ 0 ] ) ) {
  45.             flag = 0;
  46.             printf("First letter of name should be an alphabet (A-Z or a-z), found: %s\n", name );
  47.  
  48.         }
  49.  
  50. 		// impossible
  51.         if (strlen(name) > 30) {
  52.             flag1 = 0;
  53.             printf("Length of name should be between 1 and 30 characters\n");
  54.         }
  55.  
  56.     } while (flag == 0 || flag1 == 0);
  57.  
  58.     do {
  59.         printf("\nInput phone number[6..12 digits]: ");
  60.         fgets( number, 12, stdin );
  61.         remove_trailing_newline( number );
  62.         flag2 = flag3 = 1;
  63.         int len_phone = strlen( number );
  64.  
  65.         for (i = 0; i < strlen(number); i++) {
  66.             if ( !isdigit( number[ i ] ) ) {
  67.                 flag2 = 0;
  68.             }
  69.         }
  70.  
  71.         if (flag2 == 0) {
  72.             printf("Phone numbers should only contain digits (0-9), found:'%s'\n", number);
  73.         }
  74.  
  75.         if ( len_phone < 6 || len_phone > 12) {
  76.             flag3 = 0; 
  77.             printf("Length of phone numbers should be between 6 and 12 digits, found: %d\n", len_phone );
  78.         }
  79.  
  80.     } while (flag2 == 0 || flag3 == 0);
  81.  
  82.     printf("\n");
  83. 	printf( "Name: '%s'\n", name );
  84. 	printf( "Phone: '%s'\n", number );
  85.     printf("New contact successfully added!\n");
  86.     printf("Press Enter to continue...");
  87.     getchar();
  88.     return 0;
  89. }
  90.  
Success #stdin #stdout 0s 2116KB
comments ()
stdin
copy 
+Baltasar
Baltasar
0
+34988368891
988368891
stdout
copy 
Add New Contact

Input name [1..30 char]: First letter of name should be an alphabet (A-Z or a-z), found: +Baltasar

Input name [1..30 char]: 
Input phone number[6..12 digits]: Length of phone numbers should be between 6 and 12 digits, found: 1

Input phone number[6..12 digits]: Phone numbers should only contain digits (0-9), found:'+3498836889'

Input phone number[6..12 digits]: Length of phone numbers should be between 6 and 12 digits, found: 1

Input phone number[6..12 digits]: 
Name: 'Baltasar'
Phone: '988368891'
New contact successfully added!
Press Enter to continue...
https://ideone.com/j2Qiep
Checked input in C
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!