Star Patterns in C

Two pyramids in two for loop

When using two for loops separately inside the main for loop to create this pyramid, it takes a lot of memory and time to compile. So it is efficient in every way to use only one for loop and an if statement inside the main for loop.

Output :

 
    *
   **
  ***
 ****
  ***
   **
    *

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#include <stdio.h> int main(void) { int a, b, c; for (a = 1; a <= 9; a++) { for (b = 0; b < 5; b++) { if ((a < (4 + b)) && (a > (4 - b))) { printf("*"); } else { printf(" "); } } printf("\n"); } return 0; }