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Add the title "More information " to the article (#22288)

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Muralidharan Sekar
2018-11-20 19:10:29 +05:30
committed by Tom
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guide/english/c/conditional-statements/index.md
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@ -16,6 +16,7 @@ if(boolean_expression)
//Block of Statements executed when boolean_expression is true //Block of Statements executed when boolean_expression is true
} }
``` ```
#### Example #### Example
```C ```C
int a = 100; int a = 100;
@ -24,13 +25,13 @@ if(a < 200)
printf("a is less than 200\n" ); printf("a is less than 200\n" );
} }
``` ```
#### Result #### Result
`a is less than 200` `a is less than 200`
## 2. if...else statement ## 2. if...else statement
If the Boolean expression evaluates to **true**, then the if block will be executed, otherwise, the else block will be executed. If the Boolean expression evaluates to **true**, then the if block will be executed, otherwise, the else block will be executed.
#### Syntax #### Syntax
```C ```C
if(boolean_expression) if(boolean_expression)
@ -42,6 +43,7 @@ else
//Block of Statements executed when boolean_expression is false //Block of Statements executed when boolean_expression is false
} }
``` ```
#### Example #### Example
```C ```C
int a = 300; int a = 300;
@ -54,8 +56,8 @@ else
printf("a is more than 200\n"); printf("a is more than 200\n");
} }
``` ```
#### Result
#### Result
`a is more than 200` `a is more than 200`
## 3. if...else if...else statement ## 3. if...else if...else statement
@ -83,6 +85,7 @@ else
//Block of Statements executed when all boolean_expression_1, boolean_expression_2 and boolean_expression_3 are false //Block of Statements executed when all boolean_expression_1, boolean_expression_2 and boolean_expression_3 are false
} }
``` ```
#### Example #### Example
```C ```C
int a = 300; int a = 300;
@ -103,12 +106,13 @@ else
printf("a is more than 300\n"); printf("a is more than 300\n");
} }
``` ```
#### Result
#### Result
`a is equal to 300` `a is equal to 300`
## 4. Nested if statement ## 4. Nested if statement
It is always legal in C programming to nest if-else statements, which means you can use one if or else if statement inside another if or else if statement(s). It is always legal in C programming to nest if-else statements, which means you can use one if or else if statement inside another if or else if statement(s).
#### Syntax #### Syntax
```C ```C
if(boolean_expression_1) if(boolean_expression_1)
@ -136,11 +140,11 @@ if(a == 100)
``` ```
#### Result #### Result
```bash ```bash
a is equal to 100 a is equal to 100
b is equal to 200 b is equal to 200
``` ```
## 5. Switch Case Statement ## 5. Switch Case Statement
The switch statement is often faster than nested if...else (not always). Also, the syntax of switch statement is cleaner and easy to understand. The switch statement is often faster than nested if...else (not always). Also, the syntax of switch statement is cleaner and easy to understand.
@ -162,6 +166,7 @@ switch (n)
// code to be executed if n doesn't match any constant // code to be executed if n doesn't match any constant
} }
``` ```
When a case constant is found that matches the switch expression, control of the program passes to the block of code associated with that case. When a case constant is found that matches the switch expression, control of the program passes to the block of code associated with that case.
In the above pseudocode, suppose the value of n is equal to constant2. The compiler will execute the block of code associate with the case statement until the end of switch block, or until the break statement is encountered. In the above pseudocode, suppose the value of n is equal to constant2. The compiler will execute the block of code associate with the case statement until the end of switch block, or until the break statement is encountered.
@ -169,7 +174,7 @@ In the above pseudocode, suppose the value of n is equal to constant2. The compi
The break statement is used to prevent the code running into the next case. The break statement is used to prevent the code running into the next case.
### Example: ### Example:
```C ```
// Program to create a simple calculator // Program to create a simple calculator
// Performs addition, subtraction, multiplication or division depending the input from user // Performs addition, subtraction, multiplication or division depending the input from user
@ -202,11 +207,6 @@ int main()
break; break;
case '/': case '/':
if(secondNumber==0){
printf("division with zero is not allowed\n");
break;
//Avoid runtime error of division with zero
}
printf("%.1lf / %.1lf = %.1lf",firstNumber, secondNumber, firstNumber/secondNumber); printf("%.1lf / %.1lf = %.1lf",firstNumber, secondNumber, firstNumber/secondNumber);
break; break;
@ -218,6 +218,7 @@ int main()
return 0; return 0;
} }
``` ```
### Output ### Output
``` ```
Enter an operator (+, -, *,): - Enter an operator (+, -, *,): -
@ -235,32 +236,14 @@ Finally, the break statement ends the switch statement.
If break statement is not used, all cases after the correct case is executed. If break statement is not used, all cases after the correct case is executed.
## finding the Bigger among two numbers using if else statement.
```C
int a,b;
printf("Enter the first number: \n");
scanf("%d",&a);
printf("Enter the second number: \n");
scanf("%d",&b);
//comparing the numbers
if(a>b)
{
printf("A is the Bigger number");
}
else
{
printf("B is the bigger number");
}
```
## 6. Ternary operation ## 6. Ternary operation
The ternary operator (AKA conditional operator) is an operator that takes three arguments. The first argument is a comparison argument, the second is the result upon a true comparison , and the third is the result upon a flase comparison .It can be thought of as a shortened way of writing an if-else statement. It is often used to to assign variables based on the result of a comparison. The ternary operator (AKA conditional operator) is an operator that takes three arguments. The first argument is a comparison argument, the second is the result upon a true comparison , and the third is the result upon a flase comparison .It can be thought of as a shortened way of writing an if-else statement. It is often used to to assign variables based on the result of a comparison.
#### Syntax #### Syntax
```C ```C
v = (conditional_statement) ? value_if_true : value_if_false v = (conditional_statement) ? value_if_true : value_if_false
``` ```
#### Example #### Example
```C ```C
int a, b = 10, c = 100; int a, b = 10, c = 100;
@ -269,5 +252,11 @@ printf("%d", a);
``` ```
#### Result #### Result
`2` `2`
### More Information
https://www.dotnettricks.com/learn/c/conditional-statements-if-else-switch-ladder
https://www.programiz.com/c-programming/c-if-else-statement
http://www.tutorialspoint.com/ansi_c/c_control_statements.htm