strtod

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
int main (int argc, char *argv[]) {
        char *moo = "1%";
        char *cow;
        double res;
        res = strtod(moo, &cow);
        perror("");
        printf("res:%e\n",res);
        printf("moo:%p\n",cow);
        printf("cow:%p\n",cow);
        return 0;
}