Example: Case-Flipping Function in C

C
C++
C#
Java
Python
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// Case-Flipping Function
#include <stdio.h>
#include <ctype.h> // For isupper, islower

// Function to flip the case of characters in a string
void flipCase(char *str) {
    for (int i = 0; str[i] != '\0'; i++) {
        if (isupper((unsigned char)str[i])) {
            str[i] = tolower((unsigned char)str[i]);
        } else if (islower((unsigned char)str[i])) {
            str[i] = toupper((unsigned char)str[i]);
        }
        // Non-alphabetic characters are left unchanged
    }
}

int main() {
    // Step 1: Define a string for case flipping
    char myString[] = "Flip This String 123!";

    // Step 2: Flip case and print
    printf("Original: \"%s\"\n", myString);
    flipCase(myString);
    printf("Flipped Case: \"%s\"\n", myString);

    return 0;
}