Written: August 15, 2026
Number patterns are nested-loop drills with visible structure: rows outside, columns inside.
This walkthrough keeps the logic small and readable so you can type it, run it, and then change one input at a time to see what happens.
What you will build
Print a right triangle where row i shows numbers 1..i.
- Read number of rows
- Outer loop for row i
- Inner loop print 1..i
- Newline after each row
Working C example
include <stdio.h>
int main(void) {
int rows, i, j;
printf("Enter rows: ");
if (scanf("%d", &rows) != 1 || rows < 1) return 1;
for (i = 1; i <= rows; i++) {
for (j = 1; j <= i; j++) {
printf("%d ", j);
}
printf("\n");
}
return 0;
}How the logic works
Read the program top to bottom: includes and main first, then the statements that change variables, then the print that proves the result.
If your output looks wrong, print the variables before and after the critical lines. That single habit catches most beginner bugs faster than rewriting the whole file.
Change the inner print to i instead of j for a repeated-number triangle variant.
Keep learning
If this walkthrough on C Program to Print Number Patterns Using Nested Loops helped, open the code again and change one input or assumption. Small experiments beat rereading the same example.
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