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How to print diamond in C

#include<stdio.h>
int main()
{

    int a,b,c,i,j,k,n;
        printf("Enter the (half)size of dimond:\n");
    scanf("%d",&n);

//for first half of diamond

    for(a=n;a>0;a--)
        {
             for(b=1;b<a;b++)
             {
             printf(" ");
             }
                 for(c=b-1;c<n;c++)
                 {
                    printf("*");
                    printf(" ");
                 }
           printf("\n");
        }

//for second half of diamond

    for(i=n-1;i>=0;i--)
        {
            for(j=n;j>i;j--)
           {
           printf(" ");
            }
             for(k=0;k<i;k++)
             {
                printf("*");
                printf(" ");
            }
                printf("\n");
        }
        return 0;
}

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