Thread: Validate input value

I have a program with a menu like this:

Code:

 char c;
 char option;
     
 do{     
     printf("\n1.Insert number: \n");
     printf("2. Option 2\n");
     printf("3. Option 3\n");
     printf("4. Option 4\n");
     printf("5. Quit\n");     
     printf("Enter Option: ");
     scanf("%c", &option);  
     getchar();                
             	 
    if(option=='1'){		 
       printf("Insert number:");	           
        while((c=getchar()) != '\n'){       
	//call function here
        }                      
    }

    else if(option=='2'){
	//do something
    } 
    
    else if(option=='3'){
	//do something
    }

    else if (option=='4'){
       //do something
    }
    
   else if(option=='5'){	 
	printf("The program exits now!\n");
       break;
    }

   else  {
       printf ("Invalid menu choice - try again\n")			
   }

} while (option != '5');

I want to validate that the entered option is acceptable. The system will check that the user entered an integer numeric value between 1-5. If the input is incorrect then the system will respond “Invalid menu choice ” and present the user with the menu.

When I enter 1, or 2,3,4,5.... my program works fine. But when I enter 125, the program jumps to option 1.

I know that I am wrong at getchar() line since it only gets a character. but I don't know how to fix it.

Any helps would be appreciated.