 # C Program to Generate Multiplication Table

To understand this example, you should have the knowledge of the following C programming topics:

The program below takes an integer input from the user and generates the multiplication tables up to 10.

## Multiplication Table Up to 10

``````#include <stdio.h>
int main() {
int n;
printf("Enter an integer: ");
scanf("%d", &n);

for (int i = 1; i <= 10; ++i) {
printf("%d * %d = %d \n", n, i, n * i);
}
return 0;
}
``````

Output

```Enter an integer: 9
9 * 1 = 9
9 * 2 = 18
9 * 3 = 27
9 * 4 = 36
9 * 5 = 45
9 * 6 = 54
9 * 7 = 63
9 * 8 = 72
9 * 9 = 81
9 * 10 = 90
```

Here, the user input is stored in the `int` variable n. Then, we use a `for` loop to print the multiplication table up to 10.

``````for (i = 1; i <= 10; ++i) {
printf("%d * %d = %d \n", n, i, n * i);
}```
```

The loop runs from `i = 1` to `i = 10`. In each iteration of the loop, `n * i` is printed.

Here's a little modification of the above program to generate the multiplication table up to a range (where range is also a positive integer entered by the user).

## Multiplication Table Up to a range

``````#include <stdio.h>
int main() {

int n, i, range;
printf("Enter an integer: ");
scanf("%d", &n);

// prompt user for positive range
do {
printf("Enter the range (positive integer): ");
scanf("%d", &range);
} while (range <= 0);

for (i = 1; i <= range; ++i) {
printf("%d * %d = %d \n", n, i, n * i);
}

return 0;
}
``````

Output

```Enter an integer: 12
Enter the range (positive integer): -8
Enter the range (positive integer): 8
12 * 1 = 12
12 * 2 = 24
12 * 3 = 36
12 * 4 = 48
12 * 5 = 60
12 * 6 = 72
12 * 7 = 84
12 * 8 = 96
```

Here, we have used a `do...while` loop to prompt the user for a positive range.

``````// prompt user for positive range
do {
printf("Enter the range (positive integer): ");
scanf("%d", &range);
} while (range <= 0);
``````

If the value of range is negative, the loop iterates again to ask the user to enter a positive number. Once a positive range has been entered, we print the multiplication table.