#include <iostream.h>
#include <stdlib.h>

int exp (int,int);
void readnums (int&, int&);

void main () {
int b, e;
readnums(b,e);
cout << b << ” to the ” << e << ” = ” << exp(b,e) << endl;
}

void readnums (int& b, int& e) {
int correctInput;

cout << “Enter the base and the exponent: “;
cin >> b >> e;

if (!cin) {
cout << “Disaster! Terminating program.” << endl;
exit(-1);
}

correctInput = (b >= 0) && (e >= 0);
while (!correctInput) {
cout << “Something wrong! Try again …” << endl;
cout << “Re-enter base and exponent: “;
cin >> b >> e;

if (!cin) {
cout << “Disaster! Terminating program.” << endl;
exit(-1);
}
correctInput = (b >= 0) && (e >= 0);
}

}

int exp (int b, int e) {
int result;

result = 1;
while (e != 0) {
result = result * b;
e = e – 1;
}
return(result);
}

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4. Sample program (multiplication using addition)
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