C Program For Boolean to String Conversion

Boolean to string conversion means converting a Boolean value such as true or false into its corresponding text representation. In C, Boolean values are available through the <stdbool.h> header, where true represents 1 and false represents 0.

• A conditional operator or if-else statement can be used to convert a Boolean value into "true" or "false".
• A separate function can also be created when the conversion is needed multiple times in a program.

Examples:

Input: value = true
Output: true
Explanation: The Boolean value true is converted into the string "true".

Input: value = false
Output: false
Explanation: The Boolean value false is converted into the string "false".

Approaches for Boolean to String Conversion

We can convert a Boolean value to a string using a conditional operator, an if-else statement, or a user-defined function.

1. Boolean to String Conversion Using the Conditional Operator

The conditional operator provides a simple way to choose between the strings "true" and "false" based on the Boolean value.

Algorithm:

• Declare a Boolean variable.
• Check the Boolean value using the conditional operator.
• Return "true" if the value is true.
• Otherwise, return "false".
• Print the resulting string.

#include <stdbool.h>
#include <stdio.h>

int main(){
    bool value = true;

    const char *result = value ? "true" : "false";

    printf("%s", result);

    return 0;
}

Output

true

Explanation: The variable value contains true, so the conditional operator selects the string "true" and stores its address in result.

2. Boolean to String Conversion Using if-else

We can also use an if-else statement to check the Boolean value and print the corresponding string.

Algorithm:

• Declare a Boolean variable.
• Check whether the value is true.
• If it is true, print "true".
• Otherwise, print "false".

#include <stdbool.h>
#include <stdio.h>

int main(){
    bool value = false;

    if (value)
        printf("true");
    else
        printf("false");

    return 0;
}

Output

false

Explanation: The value stored in value is false, so the else block executes and prints "false".

3. Boolean to String Conversion Using a Function

A separate function can be used to convert Boolean values into strings. This approach is useful when the conversion is required at multiple places in a program.

Algorithm:

• Create a function that accepts a Boolean value.
• Return "true" when the value is true.
• Return "false" when the value is false.
• Call the function from main().
• Print the returned string.

#include <stdbool.h>
#include <stdio.h>

const char *boolToString(bool value){
    return value ? "true" : "false";
}

int main(){
    bool value = true;

    printf("%s", boolToString(value));

    return 0;
}

Output

true

Explanation: The boolToString() function checks the Boolean value and returns the corresponding string. Since value is true, the function returns "true".

4. Boolean to String Conversion Using a String Array

A string array can map Boolean values directly to "false" and "true" because Boolean values in C evaluate to 0 or 1.

Algorithm:

• Create an array containing "false" and "true".
• Declare a Boolean variable.
• Use the Boolean value as the array index.
• Print the selected string.

#include <stdbool.h>
#include <stdio.h>

int main(){
    bool value = true;

    const char *boolString[] = {"false", "true"};

    printf("%s", boolString[value]);

    return 0;
}

Output

true

Explanation: The Boolean value true corresponds to 1, so boolString[1] selects "true". If the value were false, index 0 would select "false".