Blue Bridge Cup ALGO-84 case conversion algorithm training

Case conversion algorithm training  

Time limit: 1.0s Memory Limit: 512.0MB

 

Description of the problem
　　to write a program, enter a string (a length of no more than 20), then each character in the string case conversion, is about to become a lowercase uppercase letters, lowercase letters capitalized, then the new string output.
　　Input formats: Enter a string, and the string contains only letters which does not include other types of characters, and no spaces.
　　Output format: outputs the converted string.
Sample input and output

 

Sample input

AeDb

 

Sample Output

aEdB

 

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

int main()
{
    char s[25] = { 0 };

    scanf("%s", s);
    for (int i = 0; i < strlen(s); ++i)
    {
        if ('A' <= s[i] && s[i] <= 'Z')
            s[i] = 'a' + s[i] - 'A';
        else
            s[i] = 'A' + s[i] - 'a';
    }
    printf("%s", s);

    return 0;
}