Create a triangle [duplicate]

Answer 1

You do not need 3 loops - that is unnecessary:

int  k, l;
for(k=1; k<=5; k++)  // outer loop
{
    for(l=0; l<k; l++) // inner loop
        printf("*");
    printf("\n");

}

The idea is simple keep printing stars in inner loop as long as l is less than k. So as the row-number increases (tracked by k) so does the number of stars. Your fixed code:

for(k=1; k<=5; k++)
    {
        for(l=0; l<=k-1; l++) printf("*");
        printf("\n");
    }

Answer 2

Just remove the loop printing space. Rest of the code seems fine