Question

How to convert a string lowercase characters to uppercase and uppercase to lowercase with C

Answer 1

#include <stdio.h>
#include <string.h>
      
void flip_characters(char s[])  { 
    int len = strlen(s);
   
    for (int i = 0; i < len; i++) { 
        if (s[i] >= 'A' && s[i] <= 'Z') {
            s[i] += 32;
		}
        else { 
			if (s[i] >= 'a' && s[i] <= 'z') {
				s[i] -= 32;
			}
		}
    } 
} 
   
int main() 
{                       
    char s[] = "c pRograMMinG"; 
   
    flip_characters(s);
	
	puts(s);
   
    return 0; 
} 
 

 
/*
run:
 
C PrOGRAmmINg
 
*/

 

70+ SQL courses for beginners and professionals