C program to display patterns using do while loop

C program to display patterns using do while loop

In this tutorial, we will discuss the concept of C program to display patterns using do while loop.

In C language, we can use for loop, while loop, do-while loop to display various number, star, alphabet and binary number patterns

In this topic, we demonstrate how to display print some number and star patterns using the nested do-while loop in C language.

Program 1

Rectangle number pattern

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i=0;
    do{
        int j=1;
        while(j<=8){
            printf("%d",j);
            j++;
        }
        printf("\n");
        i++;
    }
    while(i<=6);
    getch();
    return 0;
}

When the above code is compiled and executed, it produces the following results

12345678
12345678
12345678
12345678
12345678
12345678

Triangle number pattern

Program 2

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int row=1,column=1;
    int i;
    do{
            i=8;
    do{
            i--;
        }while(i>=row);
        column=1;
        do{
                printf("%d",column);
                printf(" ");
        column++;
    }while(column<=row);
            printf("\n");
            row++;
    }while(column<=6);
    getch();
    return 0;
}

When the above code is compiled and executed, it produces the following results

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6

Rectangle star pattern

Program 3

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i=0;
    do{
        int j=1;
        while(j<=7)
        {
            printf("*");
            j++;
        }
        printf("\n");
        i++;
    }
    while(i<=7);
    getch();
    return 0;
}

When the above code is compiled and executed, it produces the following results

*******
*******
*******
*******
*******
*******
*******
*******

Triangle star pattern

Program4

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int row=1,column=1;
    int i;
    do{
            i=8;
    do{
            i--;
        }while(i>=row);
        column=1;
        do{
                printf("*");
                printf(" ");
        column++;
    }while(column<=row);
            printf("\n");
            row++;
    }while(column<=6);
    getch();
    return 0;
}

When the above code is compiled and executed, it produces the following results

*
* *
* * *
* * * *
* * * * *
* * * * * *

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