Sure, here are some of the most commonly used input and output functions in C:

1. `scanf`: This is an input function used to read data from the keyboard. It reads the value, converts it into the specified data type and then stores it in the memory.

Example:
```c
int num;
printf("Enter a number: ");
scanf("%d", &num);
```
In this example, `scanf` reads an integer value from the user and stores it in the variable `num`.

2. `printf`: This is an output function used to print data on the console. It writes the output to the standard output (screen).

Example:
```c
int num = 10;
printf("The number is %d", num);
```
In this example, `printf` prints the value of the variable `num` on the console.

3. `gets`: This is an input function used to read a string from the user until the newline character is encountered.

Example:
```c
char str[100];
printf("Enter a string: ");
gets(str);
```
In this example, `gets` reads a string from the user and stores it in the character array `str`.

4. `puts`: This is an output function used to print a string on the console. It writes the string to the standard output (screen) and appends a newline character at the end.

Example:
```c
char str[] = "Hello, World!";
puts(str);
```
In this example, `puts` prints the string `str` on the console.

Please note that `gets` function is dangerous because it does not check array bounds and can cause buffer overflow. It's recommended to use `fgets` instead.

Question

Sure, here are some of the most commonly used input and output functions in C:

1. `scanf`: This is an input function used to read data from the keyboard. It reads the value, converts it into the specified data type and then stores it in the memory.

Example:
```c
int num;
printf("Enter a number: ");
scanf("%d", &num);
```
In this example, `scanf` reads an integer value from the user and stores it in the variable `num`.

2. `printf`: This is an output function used to print data on the console. It writes the output to the standard output (screen).

Example:
```c
int num = 10;
printf("The number is %d", num);
```
In this example, `printf` prints the value of the variable `num` on the console.

3. `gets`: This is an input function used to read a string from the user until the newline character is encountered.

Example:
```c
char str[100];
printf("Enter a string: ");
gets(str);
```
In this example, `gets` reads a string from the user and stores it in the character array `str`.

4. `puts`: This is an output function used to print a string on the console. It writes the string to the standard output (screen) and appends a newline character at the end.

Example:
```c
char str[] = "Hello, World!";
puts(str);
```
In this example, `puts` prints the string `str` on the console.

Please note that `gets` function is dangerous because it does not check array bounds and can cause buffer overflow. It's recommended to use `fgets` instead.

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