A Bitwise And operator is represented as ‘&’ and a logical operator is represented as ‘&&’. The following are some basic differences between the two operators.

**a) **The logical and operator ‘&&’ expects its operands to be boolean expressions (either 1 or 0) and returns a boolean value.

The bitwise and operator ‘&’ work on Integral (short, int, unsigned, char, bool, unsigned char, long) values and return Integral value.

`#include<stdio.h>` `int` `main()`
`{` ` ` `int` `x = 3; ` `//...0011`
` ` `int` `y = 7; ` `//...0111`
` ` `// A typical use of '&&'`
` ` `if` `(y > 1 && y > x)`
` ` `printf` `(` `"y is greater than 1 AND x\n"` `);`
` ` `// A typical use of '&'`
` ` `int` `z = x & y; ` `// 0011`
` ` ` ` `printf` `(` `"z = %d"` `, z);`
` ` `return` `0;`
`} ` |

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**Output**

y is greater than 1 AND x z = 3

**b)** If an integral value is used as an operand for ‘&&’ which is supposed to work on boolean values, the following rule is used in C.

…..Zero is considered as false and non-zero is considered as true.

For example in the following program x and y are considered as 1.

`#include<stdio.h>` `// Example that uses non-boolean expression as ` `// operand for '&&'` `int` `main()`
`{` ` ` `int` `x = 2, y = 5;`
` ` `printf` `(` `"%d"` `, x&&y);`
` ` `return` `0;`
`}` |

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**Output**

1

It is compiler error to use the non-integral expression as operand for bitwise &. For example the following program shows compiler error.

`#include<stdio.h>` `// Example that uses non-integral expression as ` `// operator for '&'` `int` `main()`
`{` ` ` `float` `x = 2.0, y = 5.0;`
` ` `printf` `(` `"%d"` `, x&y);`
` ` `return` `0;`
`}` |

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**Output: **

error: invalid operands to binary & (have 'float' and 'float')

**c)** The ‘&&’ operator doesn’t evaluate the second operand if the first operand becomes false. Similarly ‘||’ doesn’t evaluate the second operand when first operand becomes true. The bitwise ‘&’ and ‘|’ operators always evaluate their operands.

`#include<stdio.h>` `int` `main()`
`{` ` ` `int` `x = 0;`
` ` `// 'Geeks in &&' is NOT `
` ` `// printed because x is 0`
` ` `printf` `(` `"%d\n"` `, (x && ` `printf` `(` `"Geeks in && "` `)));`
` ` `// 'Geeks in &' is printed`
` ` `printf` `(` `"%d\n"` `, (x & ` `printf` `(` `"Geeks in & "` `)));`
` ` `return` `0;`
`}` |

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**Output**

0 Geeks in & 0

The same differences are there between logical OR ‘||’ and bitwise OR ‘|’.

This article is contributed by** Ujjwal Jain**. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

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