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Output: The length of string1 will be as shown in Figure 4.69.

FOR ONLINE READING ONLY
Figure 4.69: Output of string length function Chapter Four: Object oriented programming with C++

strcmp( )
The following Program Example 4.39 shows the use of the string function that
compares the two string values and returns 0 if the two strings are the same; returns
-1 if the value of string1<string2, and 1 when string1>string2.

This function is used in a scenario where you are required to enter your name and
password to login to a particular website. In such cases, at the administrator side , it
is needed to build and script functions that will check and compare the input string
(login details) with the string stored in the data base of the site.

Program Example 4.39:

Using strcmp( ) string function
Taking the string s1 and s2 in strcmp(s1, s2), this string function of C++ will
compare the string s1 and s2 and return 0, -1 or 1

#include <iostream>
#include <cstring>
using namespace std;
int main()
{
char string1[]=”Hujambo”;
char string2[]=”Mwananzengo”;
cout << “The result of strcmp is : “ <<strcmp(string1, string2) <<
‘\n’;
}

Output: The result will be -1 as shown in Figure 4.70. Find the result when you
put char string1[]= “Mwananzengo” and char string2[]= “Hujambo”,
and when you put char string1[]= “Mwananzengo” and char string2[]=
“Mwananzengo”.

Figure 4.70: Output of string compare function

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Student’s Book Form Five

Computer Science Form 5.indd 291 23/07/2024 12:34