Any idea why this isn't executing when age is less than 18 and greater than 55-CodePudding

#include <stdio.h>
int main()
{
 int age,weight;
 printf("Enter your age: ");
 scanf("%d",&age);
 if (age>55 && age<=18)
     {printf("Not eligible");}
 if (age>18 && age<=55) 
    {printf("Enter your weight: ");
    scanf("%d",&weight);
    if (weight>45)  
        {printf("You satisfy all the eligibility criteria.");}
    else 
        {printf("You're not eligile for donating blood.");}}
 return 0;
}

The first "if" statement is not executing.The second "if" statement runs fine.

CodePudding user response：

The logic for the if conditionals is incorrect. Tell me: can you be teenager and middle-aged person at the same time?

CodePudding user response：

Flow and logic needed a bit of work, but you were almost there... just a couple minor adjustments.

#include <stdio.h>

int main(void)
{
    int age, weight;

    printf("Enter your age: ");
    scanf("%d", &age);
    
    if (age > 55 || age < 18)
    {
        printf("Not eligible.\n");
        return 1; /* EXIT_FAILURE */
    }
    else
    {
        printf("Enter your weight: ");
    
        scanf("%d",&weight);
    
        if (weight > 45)
            printf("You satisfy all the eligibility criteria.\n");
        else
            printf("You're not eligile for donating blood.\n");
    }
    
    return 0;
}

CodePudding user response：

#include <stdio.h>
int main()
{
 int age,weight;
 printf("Enter your age: ");
 scanf("%d",&age);
 if (age>55 || age<=18) // here you did logical error
     {
       printf("Not eligible");
     }
 if (age>18 && age<=55)
    {
      printf("Enter your weight: ");
      scanf("%d",&weight);
      if (weight>45)
        {
          printf("You satisfy all the eligibility criteria.");
        }
    else
        {
          printf("You're not eligible for donating blood.");}
        }
 return 0;
}

CodePudding user response：

You are misusing logic operators in the following line. (Hint: '&&')

if (age>55 && age<=18)