- C++ Basics
- C++ Object Oriented
- C++ Advanced
- Compares the C string str1 to the C string str2. This function starts comparing the first character of each string. If they are equal to each other, it continues with the following pairs until the characters differ or until a terminating null-character is reached. This function performs a binary comparison of the characters.
- C Program to Concatenate Two Strings In this example, you will learn to concatenate (join) two strings (both string objects and C-style strings). To understand this example, you should have the knowledge of the following C programming topics.
Jan 17, 2016 String comparison in C programming, you can compare two string to see the video. Program to Compare Two Strings Using Functions. This program is the same as the above example. However, this time, we are using the Functions concept to separate the logic from the main program. As you can see, we created a function comparestrings to compare the strings. How to compare two strings in C. There are two approaches: By using the relational operator: Here we will use the relational operator in between two strings to compare with each other.
- C++ Useful Resources
How To Compare Two Strings
- Selected Reading
C++ provides following two types of string representations −
- The C-style character string.
- The string class type introduced with Standard C++.
The C-Style Character String
The C-style character string originated within the C language and continues to be supported within C++. This string is actually a one-dimensional array of characters which is terminated by a null character '0'. Thus a null-terminated string contains the characters that comprise the string followed by a null.
The following declaration and initialization create a string consisting of the word 'Hello'. To hold the null character at the end of the array, the size of the character array containing the string is one more than the number of characters in the word 'Hello.'
If you follow the rule of array initialization, then you can write the above statement as follows −
![Success Success](/uploads/1/2/6/4/126468585/253498919.jpg)
Following is the memory presentation of above defined string in C/C++ −
Actually, you do not place the null character at the end of a string constant. The C++ compiler automatically places the '0' at the end of the string when it initializes the array. Let us try to print above-mentioned string −
When the above code is compiled and executed, it produces the following result −
C++ supports a wide range of functions that manipulate null-terminated strings −
Sr.No | Function & Purpose |
---|---|
1 | strcpy(s1, s2); Copies string s2 into string s1. |
2 | strcat(s1, s2); Concatenates string s2 onto the end of string s1. |
3 | strlen(s1); How to boot camp mac for free. Returns the length of string s1. |
4 | strcmp(s1, s2); Returns 0 if s1 and s2 are the same; less than 0 if s1<s2; greater than 0 if s1>s2. |
5 | strchr(s1, ch); Returns a pointer to the first occurrence of character ch in string s1. |
6 | strstr(s1, s2); Returns a pointer to the first occurrence of string s2 in string s1. |
Following example makes use of few of the above-mentioned functions −
When the above code is compiled and executed, it produces result something as follows −
C++ Compare 2 Strings
![Strings Strings](/uploads/1/2/6/4/126468585/278138183.jpg)
The String Class in C++
The standard C++ library provides a string class type that supports all the operations mentioned above, additionally much more functionality. Let us check the following example −
When the above code is compiled and executed, it produces result something as follows −