It is quite common in C code to compare string lengths to find out which string contains more characters. This is useful for sorting data. You need a special function to compare strings - don't use! = Or ==.
Steps
Step 1. The C programming language includes two functions with which you can compare string lengths
Both of these functions are included in the library.
- strcmp () - This function compares two strings and returns the difference in number of characters.
- strncmp () - This function is similar to strcmp () except that the first n characters are compared. It is considered more secure because it avoids overflow failures.
Step 2. Start the program with the required libraries
You will need libraries and, as well as any other libraries required for your particular program.
#include #include
Step 3. Enter the int function
It returns an integer as a result of comparing the length of two strings.
#include #include int main () {}
Step 4. Identify the two strings you want to compare
In our example, let's compare two strings of type char. Also define the return value as an integer.
#include #include int main () {char * str1 = "apple"; char * str2 = "orange"; int ret; }
Step 5. Enter the comparison function
In our example, we will use the strncmp () function. In it you need to set the number of measured characters.
#include #include int main () {char * str1 = "apple"; char * str2 = "orange"; int ret; ret = strncmp (str1, str2, 8); / * Compares two strings that are no more than 8 characters long * /}
Step 6. Enter the conditional If
… Else. It is needed to show which line is longer. The strncmp () function will return 0 if the string lengths are the same, a positive number if str1 is longer, and a negative number if str2 is longer.
#include #include int main () {char * str1 = "apple"; char * str2 = "orange"; int ret; ret = strncmp (str1, str2, 8); if (ret> 0) {printf ("str1 is longer"); } else if (ret <0) {printf ("str2 is longer"); } else {printf ("Line lengths are equal"); } return (0); }