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

int main() {
    char c[10]="EE";
    //scanf("%s",&c);
    int i, sum=0;
    for(i=0;i<strlen(c);i+1){ 
                     if('A'<=c[i]&&c[i]<='F')c[i]+=10-'A';
                     else c[i]-='0';
                     sum=sum+c[i]*pow(16,strlen(c)-1-i);
    }
    
    printf("10진수 변환:  %d\n",sum);
    
    return 0;
}

In function `main':
undefined reference to `pow'