4.Triangle pattern with left spacing

 

I have added numbers to make you understand how we will create this pattern using for loop

• As we know we first see how many lines of code needs to be printed, in this case it is 9
• Since we will take user input it can be simply n which will be taken from user
• Here there is a difference that only stars are not being printed
• Along with the stars space is also being printed
• Inside outer i for loop there will be two loops one for star and another for space
• For space we will use variable s
• For i=1 ,the number of space is 8,for i=4 it is 5
• Here we can see space is being printed n-i times
• So s will iterate from from 1 to n-i
• As we can see for each line the stars printed are same as i's value
• For i=1, stars printed is 1,for i=n it is n
• So j loop that will decide what needs to be printed will iterate from 1 to i
• Remember to print "\n" to make it move to next line

Code

#include<stdio.h>

#include<conio.h>

void main(){

int i,j,n,s;

clrscr();

printf("Enter number of lines ");

scanf("%d",&n);

for(i=1;i<=n;i++)

    {    for(s=1;s<=n-i;s++)

                {

                   printf(" ");

                  }

          for(j=1;j<=i;j++)

               {

                 printf("*");   

                   }

           printf("\n");

     }

getch();

}

Note: scanf is used for taking user input,s is for space , j for pattern