atof : atof « stdlib.h « C Tutorial

1. C Tutorial
2. stdlib.h
3. atof

#include <stdlib.h>
  #include <stdio.h>
  int main(void)
  {
    char num1[80], num2[80];

    printf("Enter first: ");
    gets(num1);
    printf("Enter second: ");
    gets(num2);
    printf("The sum is: %lf.", atof(num1) + atof(num2));

    return 0;
  }

Enter first: 1
Enter second: 2
The sum is: 3.000000.