# C - Limiting Input Using a for Loop

## Introduction

You can use a for loop to limit the amount of input from the user.

Each iteration of the loop will permit some input to be entered.

In the following code user will guess a number that the program has picked.

It uses one for loop and if statements.

## Demo

```#include <stdio.h>

int main(void)
{
int chosen = 15;                    // The lucky number
int guess = 0;                      // Stores a guess
int count = 3;                      // The maximum number of tries

printf("\nThis is a guessing game.");
printf("\nI have chosen a number between 1 and 20"
" which you must guess.\n");

for( ; count > 0 ; --count)
{//from w w w.ja v  a  2 s. c  om
printf("\nYou have %d tr%s left.", count, count == 1 ? "y" : "ies");
printf("\nEnter a guess: ");      // Prompt for a guess
scanf("%d", &guess);              // Read in a guess

// Check for a correct guess
if(guess == chosen)
{
printf("\nCongratulations. You guessed it!\n");
return 0;                       // End the program
}
else if(guess < 1 || guess > 20)  // Check for an invalid guess
printf("I said the number is between 1 and 20.\n ");
else
printf("Sorry, %d is wrong. My number is %s than that.\n",
guess, chosen > guess ? "greater" : "less");
}
printf("\nYou have had three tries and failed. The number was %d\n",
chosen);
return 0;
}
```

## Result

The number of guesses that can be entered is controlled by this loop:

```for( ; count > 0 ; --count)
{
...
}
```

You check whether it's correct with these statements:

```if(guess == chosen)
{
printf("\nCongratulations. You guessed it!\n");
return 0;                         // End the program
}
```

If the guess is correct, you display a suitable message and execute the return statement.