c - invalid type argument of unary '*' -


i'm week intro programming class, , i'm having trouble fixing what's supposed relatively simple code. keep getting invalid type argument of unary '*' error. 

#include <stdio.h> #define pi 3.14159;  int main() {    float r;    float area;    scanf("%f", &r);    area = pi * r * r;    printf("area %f", area);    return 0;  }

could explain this, , how fix it? 

#define pi 3.14159;                    ^

drop semicolon. leaving in, code expand to:

area = 3.14159; * r * r;

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