In this article we will show you, How to check whether the given character is a lowercase alphabet or not using islower built-in function and not using islower function.
islower Function
In C Programming, islower is a built-in function present in the header file which is used to check whether the character is lowercase alphabet or not. The Syntax of theislower function is
islower();
islower function will return an integer value as output.
- If the character inside the islower function is in lowercase then it will return non zero value
- If the character inside the islower function is not in lowercase then it will return 0
C Program to Check Whether Character is Lowercase or Not using islower function
This C program allows the user to enter any character and check whether the character is lowercase alphabet or not
CODE
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#include #include int main() { char Ch; printf("\n Please Enter any alphabet\n"); scanf("%c", &Ch); if ( islower(Ch) ) { printf ("\n Entered character is lowercase alphabet"); } else { printf("\n Entered character is Not lowercase alphabet"); } } |
OUTPUT
ANALYSIS
In this program we declared a character variable Ch. Below printf statement will asked to enter any character he like.
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printf("\n Please Enter any character \n"); |
Below scanf statement will assign the user entered character to Ch variable
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scanf("%c", &Ch); |
In the next line we used the If Statement,
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if (islower(Ch)) |
If the above condition is TRUE then the given character is a lowercase alphabet So, it will print below statement
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printf ("\n Entered character is lowercase alphabet"); |
If the above condition is FALSE then the given character is not lowercase alphabet So, it will print below statement
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printf ("\n Entered character is Not lowercase alphabet"); |
C Program to Check Whether Character is Lowercase or Not without using islower function
This C program allows the user to enter any character and check whether the character is lowercase alphabet or not without using islower function
CODE
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#include int main() { char Ch; printf("\n Please Enter any alphabet\n"); scanf("%c", &Ch); if (Ch >= 'a' && Ch <= 'z') { printf ( "\nEntered character is lowercase alphabet") ; } else { printf("\nEntered character is Not lowercase alphabet"); } } |
OUTPUT
Let us check with false value
ANALYSIS
If you look at the If Statement
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if (Ch >= 'a' && Ch <= 'z') |
As we all know that, all the lowercase characters are between a and z. So, the above if condition will check whether the given character is between a and z.
If the above condition is TRUE then the given character is a lowercase alphabet So, it will print below statement
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printf ("\n Entered character is lowercase alphabet"); |
If the above condition is FALSE then the given character is not lowercase alphabet So, it will print below statement
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printf ("\n Entered character is Not lowercase alphabet"); |
C Program to Check Whether Character is Lowercase or Not using ASCII Values
This C program allows the user to enter any character and check whether the character is lowercase alphabet or not without using islower function.
CODE
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#include int main() { char Ch; printf("\n Please Enter any character\n"); scanf("%c", &Ch); if (Ch >= 97 && Ch <= 122) { printf ( "\nEntered character is lowercase alphabet") ; } else { printf("\nEntered character is Not lowercase alphabet"); } } |
OUTPUT
ANALYSIS
If you look at the If Statement
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if (Ch >= 97 && Ch <= 122) |
If the above condition is TRUE then the given character is a lowercase alphabet So, it will print below statement
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printf ("\n Entered character is lowercase alphabet"); |
If the above condition is FALSE then the given character is not lowercase alphabet So, it will print below statement
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printf ("\n Entered character is Not lowercase alphabet"); |
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