/* These are includes */#include <stdio.h>/* This is the main function */int main(void){ /* You guessed it, more declarations */ int choice=0; int in0=0; int in1=0; /* Clear the screen and show the options */ system("CLS"); printf("What do you want to do?"); printf("\n1) Add\n2) Subtract\n"); printf("3) Multiply\n4) Divide\n"); printf("What is your choice? "); /* Prompts for input */ scanf("%d", &choice); printf("\n\n"); if(choice!=1 && choice!=2 && choice!=3 && choice!=4){ /* If the choice is invalid, tell the user */ printf("Not a valid choice!"); } else{ /* If the choice is valid, prompt for input and perform the calculation */ printf("What are the two numbers?\nFirst number? "); scanf("%d", &in0); printf("Second number? "); scanf("%d", &in1); if(choice==1){ printf("\n\nThe answer is %d", in0+in1); } if(choice==2){ printf("\n\nThe answer is %d", in0-in1); } if(choice==3){ printf("\n\nThe answer is %d", in0*in1); } if(choice==4){ printf("\n\nThe answer is %d", in0/in1); } }}