scanf prototype in c

The prototype for the scanf function in C is as follows:

int scanf(const char *format, ...);

The scanf function is used to read input from the standard input stream (stdin) based on the specified format. It takes a format string as its first argument, which specifies the expected input format. The remaining arguments are pointers to the variables where the input values will be stored.

Here's an example usage of scanf:

int age;
printf("Enter your age: ");
scanf("%d", &age);
printf("Your age is: %d\n", age);

In this example, the %d format specifier is used to read an integer value from the user. The &age expression is used to pass the address of the age variable to scanf, so that the entered value can be stored in that variable.

Please note that the scanf function returns the number of input items successfully matched and assigned, which can be used for error handling or validation purposes.

I hope this information is helpful! Let me know if you have any further questions.