Hi what's wrong with this code?

Question

//Program in C to invert case of alphabets
#include <stdio.h>
#include <string.h>
int main() {
char str[20];
scanf("%s", str);
int l= strlen(str);
printf("%s", str);
for(int i=0; i<=l-1; i++){
printf("\n%d", str[i]);
if(str[i]>=65 && str[i]<=90)
str[i]= str[i]+32;
if(str[i]>=97 && str[i]<=122)
str[i]= str[i]-32;
}
printf("\n%s", str);
return 0;
}
//Runs on compiler but the entire string is converted to upper case.

Answer 1

you need a continue statement in the first if-statement to skip the rest of the loop or make second if-statement an else if.

if you invert from upper to lower case in first if-block, the second if-block will see them as lowercase and invert them back to uppercase.

Answer 2

Thankyou @ Gen200
Great Lesson!!