Question

How to convert a character inside string to uppercase in C

Answer 1

#include <stdio.h>
#include <string.h>
#include <ctype.h>

void char_to_uppercase(char s[], int idx) { 
	if (idx < 0 || idx > strlen(s)) return;
          
	for (int i = 0; i < strlen(s); i++) {
		 if (i == idx) {
			 s[i] = toupper(s[i]);
		 }
	}
}
int main() 
{                       
    char s[] = "c programming"; 
   
    char_to_uppercase(s, 3);
	puts(s);
   
    char_to_uppercase(s, 0);
	puts(s);
	
	char_to_uppercase(s, strlen(s) - 1);
	puts(s);
	
    return 0; 
} 
 
 
 
/*
run:
 
c pRogramming
C pRogramming
C pRogramminG
 
*/

 

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