06-2. case-insensitive conversion of string letters (10)

Enter a string ending with #. This question requires that all lowercase letters be converted to uppercase letters, and all uppercase letters be converted to lowercase letters. Other characters remain unchanged.

Input Format:

Enter a non-null string with a length not greater than 40 and ended with # in a row.

Output Format:

Output the converted string in one line as required.

Input example:

Hello World! 123#

Output example:

hELLO wORLD! 123

 1 #include <stdio.h> 2  3 int main() 4 { 5     char s[40]; 6     int i = 0; 7     do { 8         scanf("%c", &s[i]); 9         i++;10     } while(s[i-1] != ‘#‘);11     int j;12     for(j = 0; j < i-1; j++) {13         if(s[j] >= ‘a‘ && s[j] <= ‘z‘) {14             s[j] -= 32;15         }16         else if (s[j] >= ‘A‘ && s[j] <= ‘Z‘) {17             s[j] += 32;18         }19     }20     for(i = 0; i < j; i++) {21         printf("%c", s[i]);22     }23     24     return 0;25 }