Conditional Statements in C

Conditional Statements

In c programming language, decision making is used to specify the order in which statements are executed. In C we use conditional statements to achieve this.

There can be any type of control structures. In our daily life, these kinds of control structures generally achieve or used in our decision-making process.

Control Structures types.
If then            If I exercise daily then I will be fit
If else             If today rains then I will play FIFA else I will not play FIFA.
else if     

In programming, we use a conditional statement to make decisions in the same way as in real life.
If Statement Example
if the expression it true evaluate the statement.

 if (expession) {  
     statement  
 }  

C example. You have given a number, check if the number is positive print Positive on the terminal.

 if (number > 0) {  
     printf("Positive");  
 }  

If Else Statement Example
If the expression is true to evaluate statement 1 otherwise evaluate statement 2

 if (expression) {  
     statement 1  
 } else {  
     statement 2  
 }  

C example. You have given a number, check if the number is positive or not positive and print Positive or Not Positive on the terminal.

 if (number > 0) {  
     printf("Positive");  
 } else {  
     printf("Not Positive");
 }  

Else If Example

if expression 1 is true to evaluate statement 1 if expression 1 is false check expression 2 if it is true to evaluate statement 2 otherwise evaluate statement 3

 if (expression 1) {  
     statement 1  
 } else if (expession 2) {  
     statement 2  
 } else {  
     statement 3  
 }  

C example. You have given a number, check number is positive, negative or zero and print on terminal positive, negative and zero in respective cases. 

 if (number > 0) {  
     printf("Positive");  
 } else if (number == 0) {  
     printf("ZERO");  
 } else {  
     printf("Negative"); 
 }  

Example: Take an input from a user and check number is positive negative or zero.

 #include<stdio.h>  
 int main() {  
      int number;  
      scanf("%d", &number);  
      if (number > 0) {  
     printf("Positive");  
      } else if (number == 0) {  
     printf("Zero");  
      } else {  
     printf("Negative");  
      }  
 }  

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.