Convert Integer to String

Code

#include <stdio.h>

void print_integer_as_string(int num) {
    // Your logic here
        char buffer[12]; // Enough for -2147483648 + null terminator
    int i = 0;

    // Handle zero explicitly
    if (num == 0) {
        printf("0\n");
        return;
    }

    // Handle negative numbers
    if (num < 0) {
        putchar('-');
        putchar(' ');
        num = -num;
    }

    // Extract digits in reverse
    while (num > 0) {
        buffer[i++] = '0' + (num % 10);
        num /= 10;
    }

    // Print digits in correct order with spaces
    while (i--) {
        putchar(buffer[i]);
        if (i > 0) putchar(' ');
    }
    putchar('\n');

}

int main() {
    int num;
    scanf("%d", &num);
    print_integer_as_string(num);
    return 0;
}

Solving Approach

Handle Zero Case

• If num == 0, print '0' and return

Handle Negative Numbers

• If num < 0:
• Print '-' followed by a space
• Convert num to positive using num = -num

Extract Digits in Reverse

• Use a buffer (e.g., char buffer[12]) to store digits
• Loop:
• digit = num % 10
• Convert to character: '0' + digit
• Store in buffer
• num = num / 10

Print Digits in Correct Order

• Loop from buffer end to start
• Print each character followed by a space (except after the last digit)