Print Diamond Shape for number of row enter by user using * like -

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

Click here to open this program in Turbo C++

/*******************************************************
 Statement - Print Diamond
 Programmer - Vineet Choudhary
 Written For - http://developerinsider.in
 *******************************************************/

#include <stdio.h>
#include <conio.h>

void main()  
{
    int n, c, k, space = 1;
    clrscr();

    printf("Enter number of rows\n");
    scanf("%d", &n);

    space = n - 1;

    for (k = 1; k <= n; k++)
    {
        for (c = 1; c <= space; c++)
            printf(" ");

        space--;

        for (c = 1; c <= 2*k-1; c++)
            printf("*");

        printf("\n");
    }

    space = 1;

    for (k = 1; k <= n - 1; k++)
    {
        for (c = 1; c <= space; c++)
            printf(" ");

        space++;

        for (c = 1 ; c <= 2*(n-k)-1; c++)
            printf("*");

        printf("\n");
    }

    getch();
}