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#include <stdio.h>
#include <math.h>

int main()
{
    float a, b, c, S, p;
    
    printf("Please enter a:");
    scanf("%d", &a);

    printf("Please enter b:");
    scanf("%d", &b);
    
    printf("Please enter c:");
    scanf("%d", &c);
    
    p = (a+b+c)/2;
    
    S = sqrt(p*(p-a)*(p-b)*(p-c));
    
    printf("The area of triangle: %d", &S);
    
    return 0;
}