Toggle Case

Easy Strings
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Problem Statement

Write a C program to toggle the case of each character in a string (convert uppercase to lowercase and lowercase to uppercase).

Input Format

A single line containing a string.

Output Format

Print the string with toggled case.

Constraints

Length <= 100

Sample Input

HelloWorld

Sample Output

hELLOwORLD

Explanation

Iterate through the string, subtracting 32 from uppercase letters and adding 32 to lowercase letters.

Starter Code

#include <stdio.h>

int main() {
    char str[101];
    if (scanf("%100s", str) == 1) {
        // Write your code here to toggle case
    }
    return 0;
}

Limits

  • Time Limit: 1s
  • Memory Limit: 256MB

Embedded C Programming

Updated: March 15, 2026
Intermediate

Embedded systems rely on efficient low-level programming to interact directly with hardware. In this course, you will learn how to write practical Embedded C programs used in real microcontroller-based systems. Rather than focusing only on theory, this course follows a practice-driven approach. Each lesson includes hands-on coding exercises that simulate real firmware development tasks used