Validate positives

hi everyone i'm programming validation of a number that only accepts positive integers the code below is for only integers

Code:

---

• #include<ctype.h>
• #include<stdio.h>
• int main(void)
• {
• char buf[BUFSIZ];
• int value, end;
•     printf("Enter an integer: ");
•     fflush(stdout);
• while(fgets(buf,sizeof buf, stdin)== NULL ||
•           sscanf(buf,"%d%n",&value,&end)!=1||
• !isspace(buf[end]))
• {
•         printf("Invalid integer. Please try again: ");
•         fflush(stdout);
• }
•     printf("You entered %d\n", value);
• return0;
• }

---

But when i try to add it the validation of positives

Code:

---

• #include<ctype.h>
• #include<stdio.h>
• int main(void)
• {
• char buf[BUFSIZ];
• int value, end;
•     printf("Enter an integer: ");
•     fflush(stdout);
• 
  while(value<0)
  {
          printf("Only positives numbers. Please try again: ");
          fflush(stdout);
  }
  
  
• while(fgets(buf,sizeof buf, stdin)== NULL ||
•           sscanf(buf,"%d%n",&value,&end)!=1||
• !isspace(buf[end]))
• {
•         printf("Invalid integer. Please try again: ");
•         fflush(stdout);
• }
•     printf("You entered %d\n", value);
• return0;
• }

---

And when i compile ignores the validation of only positives. Help please.

Because you didn't put your test in the same while condition as everything else.

Try

Code:

---

while(fgets(buf,sizeof buf, stdin)== NULL ||
          sscanf(buf,"%d%n",&value,&end)!=1||
          !isspace(buf[end]) ||
          value < 0)

---

Next time, make sure you post only code between code tags. No tables / formatting / fonts / colours.

i didn't put it because i want different messages, one message for only positives and another one for only integers

So put the test inside the loop then

You mean put the (while<0) inside the other? i already do that, and the problem is when i enter a float number validates it then i enter a negative and doesn't validate it

Quote:

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Originally Posted by lifeless

You mean put the (while<0) inside the other? i already do that, and the problem is when i enter a float number validates it then i enter a negative and doesn't validate it

---

No Salem means move your condition from while into loop body

Code:

---

while(fgets(buf,sizeof buf, stdin)== NULL ||
          sscanf(buf,"%d%n",&value,&end)!=1||
          !isspace(buf[end]))
    if(value < 0)

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