C program to print multiplication table using goto statement

C program to print multiplication table using goto statement:

In this post, we will use goto statement of C programming language to print the multiplication table for a user. This program will ask the user to enter a number, it will read that number and print one multiplication table using goto for that number.

How goto works in C:

goto is used to move the control to a different point in the same function using a label. The control moves to the label pointed by goto and code execution starts from that label.

For example, let’s consider the below program:

#include <stdio.h>

int main()
{
    printf("First line\n");
    goto third_line;

    printf("Second line\n");

    third_line:
        printf("Third line\n");
}

Here, we have three printf statements. But we are using goto after the first printf statement. That will move the control to third_line and execute the third printf statement without running second printf.

If you run this program, it will print the below output:

First line
Third line

Printing the multiplication table using goto:

Let’s try to print the multiplication table using goto. We will take one number from the user and print the multiplication table for that number using goto :

#include <stdio.h>

int main()
{
    int no;

    printf("Enter a number : ");
    scanf("%d", &no);

    int currentLine = 1;

table:
    printf("%d * %d = %d\n", no, currentLine, no * currentLine);
    currentLine++;

    if (currentLine < 11)
    {
        goto table;
    }
}

Here,

• no variable is used to hold the number entered by the user.
• currentLine is used to note down the current line number. It is 1 in the beginning. We will run till it is 10.
• table is the start point of printing the multiplication table. We are printing one line of the table, incrementing the value of currentLine by 1 and if its value is less than 11, moving back to table using goto. So, it loops in the table part to print down each line of the multiplication table.

Sample output:

It will print output as like below:

Enter a number : 5
5 * 1 = 5
5 * 2 = 10
5 * 3 = 15
5 * 4 = 20
5 * 5 = 25
5 * 6 = 30
5 * 7 = 35
5 * 8 = 40
5 * 9 = 45
5 * 10 = 50

Enter a number : 10
10 * 1 = 10
10 * 2 = 20
10 * 3 = 30
10 * 4 = 40
10 * 5 = 50
10 * 6 = 60
10 * 7 = 70
10 * 8 = 80
10 * 9 = 90
10 * 10 = 100

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