Question

Hello.

for one of my assignment, I need to create any program using the C language and that must contain the following:

- Error Checking

- Use of Functions

- Menu system

- Array Processing

It can be about anything, nothing specified but must contain the features mentioned above

Thank you

Answer 1

//Required c code:

#include <stdio.h>
#include <errno.h>
#include <string.h>

int add(int a, int b){
    return a+b;
}

int main ()
{
    //error handling
    FILE *fp;

    // If a file is opened which does not exist,
    // then it will be an error and corresponding
    // errno value will be set
    fp = fopen(" abc.txt ", "r");

    // opening a file which does
    // not exist.
    printf("Value of errno: %d\n ", errno);
    printf("The error message is : %s\n",
                       strerror(errno));
    perror("Message from perror");
  
    //Use of function
    int d = add(1,2);
    printf("Sum of 1 & 2 is: %d",d);

  
    //menu system
    int x;
    printf("\nSelect an item: ");
    printf("\n1. Add");
    printf("\n2. Subtract");
    printf("\n3. Multiply\n");
    scanf("%d",&x);
    switch (x) {
        case 1:
            printf("Add selected\n");
            break;
        case 2:
            printf("Subtarct selected\n");
            break;
        case 3:
            printf("Multiply selected\n");
            break;
          
        default:
            break;
    }
  
    //array processing
    int arr[3] = {1,2,3};
    for(int i = 0;i<3;i++){
        printf("%d ",arr[i]*3);
    }
  
    return 0;
}

Please refer to the screenshot of the code to understand the indentation of the code

Output:

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