String Functions
Strings Function
Here’s a table of some commonly used string functions in C, along with a brief description of what they do:
Function Description
strlen() :Returns the length of a string, not including the terminating null character.
strcpy():Copies a string from one location to another.
strncpy():Copies a specified number of characters from one string to another.
strcat():Appends one string to the end of another.
strncat():Appends a specified number of characters from one string to another.
strcmp():Compares two strings and returns an integer that indicates their relative order.
strncmp():Compares a specified number of characters in two strings and returns an integer that indicates their relative order.
strchr():Returns a pointer to the first occurrence of a specified character in a string.
strrchr():Returns a pointer to the last occurrence of a specified character in a string.
strstr():Returns a pointer to the first occurrence of a specified substring in a string.
Memory Address
In C programming language, a memory address is a unique identifier for a location in memory. Every variable in a C program is stored in a specific memory address. We can use pointers in C to store and manipulate memory addresses.
We can use the & operator to get the memory address of a variable:
int x = 10;
int *p = &x; // p now stores the memory address of x
In this example, we declare an integer variable x and initialize it to 10. We then declare a pointer p to an integer and set it to the memory address of x using the & operator.
We can use the * operator (called the “dereference operator”) to access the value stored at a memory address:
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