C PROGRAMMING PROGRAM • CONTROL FLOW & LOOP FORMS

Print Coordinate Pairs Using Nested Loops

Learn how to print coordinate pairs using nested loops using a clear C program.

BeginnerNested loopsPairsIteration

PROBLEM UNDERSTANDING

Input and expected output

Sample input

2 3

Sample output

(1,1) (1,2) (1,3)
(2,1) (2,2) (2,3)

COMPLETE C PROGRAM

Complete C implementation

#include <stdio.h>

int main(void)
{
    int rows, columns;
    printf("Enter rows and columns: ");
    scanf("%d %d", &rows, &columns);
    for (int row = 1; row <= rows; row++) {
        for (int column = 1; column <= columns; column++)
            printf("(%d,%d) ", row, column);
        putchar('\n');
    }
    return 0;
}

CURRENT STEP

Select Start to walk through the important lines.

SELECTED LINE

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EXPECTED OUTPUT FOR THE SAMPLE

(1,1) (1,2) (1,3)
(2,1) (2,2) (2,3)

0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

Read the required input values.
For every row iteration, run the complete inner loop of column values.
Display the computed result.

For every row iteration, run the complete inner loop of column values.

EFFICIENCY

Time and space complexity

Time complexity

O(rows × columns)

Auxiliary space

O(1)

DEBUGGING CHECKLIST

Common mistakes

Check this

Use the correct format specifier for every variable.

Check this

Initialize variables before using their values.

Check this

Check braces, semicolons and input order carefully.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.