Chapter3-Q28.cpp

/*3.28 (Validating User Input) Modify the program in Figure 3.10 to validate its inputs. On any
input, if the value entered is other than 1 or 2, keep looping until the user enters a correct value.
*/
#include <stdio.h>
int main() {
  int number = 0, sum = 0, z = 100;
  while ( z >= 0 ) {
    printf("Enter a number: ");
    scanf("%d", &number );
    if ( number == 1 ) {
      return 0;
    }
    if ( number == 2 ) {
      return 0;
    }
    sum += z;
  }
  return 0;
}