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double addition(double a, double b) { return a + b; }
double subtraction(double a, double b) { return a - b; }

int main(void)
{
int choice;
printf("Enter 0 for addition or 1 for...

The normal way is using 'if'.



if (input == 0)
foo();
else if (input == 1)
bar();
else
printf("unexpected input\n");