C Tutorial/stdlib.h/atoi
atoi
Item Value Header file stdlib.h Declaration int atoi(const char *str); Function converts the string to an int value.
<source lang="cpp">#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: %d.", atoi(num1)+atoi(num2)); return 0; }</source>