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C Programming in VS Code

Printing a message in C

Beginner's Guide to Keywords, Identifiers, Constants, Variables, Datatypes in C

Operators & Expressions in C

Input & Output Operations in C

Control Statements in C

Loops in C

Array in C

Character Array & Strings in C

User Defined Functions in C

Structure and Union in C

Pointers in C

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Control Statements in C

Control statement: These statements control the flow of execution which are known as the control statements.

If statement: An if statement in C is used to make a decision in a program. It checks if a certain condition is true, and if it is, a block of code is executed.

Types of if statements:

1) Simple if statement: A simple if statement in C checks a condition and if it's true, runs a block of code.

2) If-else statement: An if-else statement in C checks a condition, if it's true it runs a block of code, if it's false it runs another block of code.

3) Nested if-else statement: A nested if-else statement in C is an if-else statement within another if-else statement. It allows for multiple conditions to be checked in a logical order.

4) If-else ladder: An if-else ladder statement in C is multiple if-else statements cascaded one after another, it checks multiple conditions and runs a different block of code based on the condition.

Switch statement: A switch statement in C is used to execute different blocks of code based on a specific value.

Control Statements in C

Simple if statement:

simple_if_program.c


#include <stdio.h>

void main() {
    int number;
    printf("Enter a number: ");
    scanf("%d", &number);
    if(number > 10) {
        printf("\nThe number is greater than 10.");
    }
    printf("\nYou entered: %d", number);
}

If else:

if_else.c


#include <stdio.h>

void main() {
    int age;
    printf("Enter age: ");
    scanf("%d", &age);
    if(age >= 18) {
        printf("\nYou can vote.");
    } else {
        printf("\nYou can't vote.");
    }
    printf("\nAge you entered: %d", age);
}

Nested if else:

nested_if_else.c


#include <stdio.h>

void main() {
    int a, b, c;
    printf("Enter three numbers(press enter or space between numbers to make them separate): ");
    scanf("%d %d %d", &a, &b, &c);
    if(a > b) {
        if(a > c) {
            printf("\n%d (FIRST) is largest.", a);
        } else {
            printf("\n%d (THIRD) is largest.", c);
        }
    } else {
        if(c > b) {
            printf("\n%d (THIRD) is largest.", c);
        } else {
            printf("\n%d (SECOND) is largest.", b);
        }
    }
}

If else Ladder:

if_else_ladder.c


#include <stdio.h>

void main() {
    int marks;
    printf("Enter the marks: ");
    scanf("%d", &marks);
    if(marks >= 60) {
        printf("\nFirst Division.");
    } else if(marks >= 45) {
        printf("\nSecond Division.");
    } else if(marks >= 35) {
        printf("\nThird Division.");
    } else {
        printf("\nFail.");
    }
}

Switch statement:

switch_program.c


#include <stdio.h>

void main() {
    char text;
    printf("Choose an option\na)Subs\tb)Like\tc)Share\n");
    text = getchar();
    switch(text) {
        case 'a':
            printf("\nSubscribe to channel.");
            break;
        case 'b':
            printf("\nLike this video.");
            break;
        case 'c':
            printf("\nShare this video with family and friends.");
            break;
        default:
            printf("\nInvalid Option.");
            break;
    }
}