C Programs

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Loop Programs in C

Print multiplication table of a number

Introduction

A multiplication table helps display the product of a number with integers from 1 to 10 (or more).

For example, if the number is 5, then the table is:

5 × 1 = 5

5 × 2 = 10

...

5 × 10 = 50

We can easily print it using a loop in C.

C Program: Print multiplication table of a number

NOTE: The Program is written using for, while and do..while loop.
Method 1 is for loop, Method 2 is while loop and Method 3 is do..while loop

Method 1: Using for loop

#include <stdio.h>
 
int main() {
    int num, i;
 
    // Input
    printf("Enter a number to print its multiplication table: ");
    scanf("%d", &num);
 
    // Print table
    printf("Multiplication Table of %d:\n", num);
    for (i = 1; i <= 10; i++) {
        printf("%d x %d = %d\n", num, i, num * i);
    }
 
    return 0;
}

 
OUTPUT :
Enter a number to print its multiplication table: 5

Multiplication Table of 5:
5 x 1 = 5
5 x 2 = 10
5 x 3 = 15
5 x 4 = 20
5 x 5 = 25
5 x 6 = 30
5 x 7 = 35
5 x 8 = 40
5 x 9 = 45
5 x 10 = 50

Explanation

1. The user enters the number.
2. The loop runs from 1 to 10.
3. In each iteration, the program calculates num * i.
4. It prints the result in the format num x i = product.

C Program: Print multiplication table of a number

Method 2: Using while loop

The while loop is an alternative to the for loop.
It can be used to print the multiplication table by controlling a counter variable manually.

#include <stdio.h>
 
int main() {
    int num, i = 1;
 
    // Input
    printf("Enter a number to print its multiplication table: ");
    scanf("%d", &num);
 
    printf("Multiplication Table of %d:\n", num);
 
    // While loop
    while (i <= 10) {
        printf("%d x %d = %d\n", num, i, num * i);
        i++; // Increment counter
    }
 
    return 0;
}

 
OUTPUT :
Enter a number to print its multiplication table: 7

Multiplication Table of 7:
7 x 1 = 7
7 x 2 = 14
7 x 3 = 21
7 x 4 = 28
7 x 5 = 35
7 x 6 = 42
7 x 7 = 49
7 x 8 = 56
7 x 9 = 63
7 x 10 = 70

Explanation

1. Initialize counter i = 1.
2. Loop continues while i <= 10.
3. Print num * i in each iteration.
4. Increment i by 1 after each loop.

C Program: Print multiplication table of a number

Method 3: Using do..while loop

The do-while loop executes the loop body at least once before checking the condition.
This is useful for printing a multiplication table since we always want at least the first multiplication (num × 1) to appear.

#include <stdio.h>
 
int main() {
    int num, i = 1;
 
    // Input
    printf("Enter a number to print its multiplication table: ");
    scanf("%d", &num);
 
    printf("Multiplication Table of %d:\n", num);
 
    // Do-while loop
    do {
        printf("%d x %d = %d\n", num, i, num * i);
        i++; // Increment counter
    } while (i <= 10);
 
    return 0;
}

 
OUTPUT :
Enter a number to print its multiplication table: 9

Multiplication Table of 9:
9 x 1 = 9
9 x 2 = 18
9 x 3 = 27
9 x 4 = 36
9 x 5 = 45
9 x 6 = 54
9 x 7 = 63
9 x 8 = 72
9 x 9 = 81
9 x 10 = 90

Explanation

1. Initialize i = 1.
2. The do block executes first and prints num × i.
3. Increment i by 1 after printing.
4. The loop continues while i <= 10.
5. Stops after printing the 10th multiple.