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;  
}

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