Problem
What is the logic in C language to print the numbers in different formats like pyramid, right angle triangle?
Solution
To print the numbers or symbols in different model we can take the help of for loop in the code.
Example1
Following is the C program to print pyramid −
#include<stdio.h>
int main(){
int n;
printf("Enter number of lines: ");
scanf("%d", &n);
printf("\n");
// loop for line number of lines
for(int i = 1; i <= n; i++){
// loop to print leading spaces in each line
for(int space = 0; space <= n - i; space++){
printf(" ");
}
// loop to print *
for(int j = 1; j <= i * 2 - 1; j++){
printf(" * ");
}
printf("\n");
}
return 0;
}Output
Enter number of lines: 8 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Example 2
Following is a program to display numbers in the form of right angled triangle (pattern) −
#include <stdio.h>
void main(){
int i,j,rows;
printf("Input number of rows : ");
scanf("%d",&rows);
for(i=1;i<=rows;i++){
for(j=1;j<=i;j++)
printf("%d",j);
printf("\n");
}
}Output
Input number of rows : 10 1 12 123 1234 12345 123456 1234567 12345678 123456789 12345678910