c - can't we use same variable name as a function? -

here code..it giving segmentation fault error...please tell me why...in small program taking 1 function add() , 1 variable int add. , inside main function creating function pointer of add() , trying print value of add variable. giving error...plz tell me why??

#include<stdio.h> float add(int , float); int main() {         float (*fp)(int , float);         float result;         int add=10;         fp = add;         result = fp(5 , 9.9);         printf("%f\n",result);         printf("%d\n",add);         return 0;  }  float add(int ,float b) {         return + b; } 

global names shadowed local names.

so, when mention add in main, try take add declared in main first.

when giving fp = add assigning integer (int add = 10) function pointer. , trying call address. invalid address (10), got segmentation fault.