Example: Manual String Lowercase Conversion in C

C
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// Manual String Lowercase Conversion
#include <stdio.h>
#include <string.h> // For strlen

int main() {
    char str[] = "HeLlO WoRlD 123!"; // Step 1: Initialize the string
    int i = 0;

    printf("Original string: %s\n", str);

    // Step 2: Iterate through the string until the null terminator is found
    while (str[i] != '\0') {
        // Step 3: Check if the character is an uppercase letter (ASCII A-Z)
        if (str[i] >= 'A' && str[i] <= 'Z') {
            // Step 4: Convert to lowercase by adding 32 to its ASCII value
            str[i] = str[i] + 32;
        }
        i++; // Move to the next character
    }

    printf("Lowercase string: %s\n", str); // Step 5: Print the modified string

    return 0;
}