C Program to get positive number using goto

C Program to get positive number using goto

This C program shows how to read the positive number till user provides.

#include<stdio.h>                                                                
                                                                                
void main()                                                                     
{                                                                               
  int number;                                                                   
  positive:                                                                     
  printf("Enter any positive number: ");                                        
  scanf("%d", &number);                                                         
  if(number>0)                                                                  
  {                                                                             
    printf("Number %d is positive!", number);                                   
  }                                                                             
  else                                                                          
  {                                                                             
    goto positive;                                                              
  }                                                                             
}                                                                      
                                                                                  

Output:

$ cc positive-number.c
$ ./a.out 
Enter any positive number: 34

$ ./a.out 
Enter any positive number: -23
Enter any positive number: 0
Enter any positive number: 3
Number 3 is positive!

C Program to get positive number using while

This C program shows how to read the positive number till user provides.

#include<stdio.h>                                                             
                                                                                
void main()                                                                     
{                                                                               
  int number;                                                                   
  while(1)                                                                      
  {                                                                             
    printf("\nEnter any positive number: ");                                    
    scanf("%d", &number);                                                       
    if(number>0)                                                                
    {                                                                           
      printf("Number %d is positive!", number);                                 
      break;                                                                    
    }                                                                           
  }                                                                             
} 

Output:

$ cc positive-number.c
$ ./a.out 
Enter any positive number: 34

$ ./a.out 
Enter any positive number: -23
Enter any positive number: 0
Enter any positive number: 3
Number 3 is positive!

C Program to get negative number using goto

This C program shows how to read the negative number till user provides.

#include<stdio.h>                                                          
                                                                                
void main()                                                                     
{                                                                               
  int number;                                                                   
  negative:                                                                     
  printf("\nEnter any negative number: ");                                        
  scanf("%d", &number);                                                         
  if(number<0)                                                                  
  {                                                                             
    printf("Number %d is negative!", number);                                   
  }                                                                             
  else                                                                          
  {                                                                             
    goto negative;                                                              
  }                                                                             
}    

Output:

$ cc negative-number.c
]$ ./a.out 
Enter any negative number: -98
Number -98 is negative!
$ ./a.out 
Enter any negative number: 2
Enter any negative number: 0
Enter any negative number: -4
Number -4 is negative![

C Program to get negative number using while

This C program shows how to read the negative number till user provides.

#include<stdio.h>                                                             
                                                                                
void main()                                                                     
{                                                                               
  int number;                                                                   
  while(1)                                                                      
  {                                                                             
    printf("\nEnter any negative number: ");                                    
    scanf("%d", &number);                                                       
    if(number<0)                                                                
    {                                                                           
      printf("Number %d is negative!", number);                                 
      break;                                                                    
    }                                                                           
  }                                                                             
} 

Output:

$ cc negative-number.c
]$ ./a.out 
Enter any negative number: -98
Number -98 is negative!
$ ./a.out 
Enter any negative number: 2
Enter any negative number: 0
Enter any negative number: -4
Number -4 is negative![