strcmp

Compare strings in Stateflow chart (case sensitive)

Syntax

tf = strcmp(str1,str2)

tf = strcmp(str1,str2,n)

Description

tf = strcmp(str1,str2) compares strings str1 and str2.

• In charts that use MATLAB^® as the action language, the operator returns 1 (true) if the strings are identical and 0 (false) otherwise.

• In charts that use C as the action language, the operator returns 0 if the strings are identical. Otherwise, it returns a nonzero integer that depends on the compiler that you use. This value can differ in simulation and generated code.

tf = strcmp(str1,str2,n) compares the first n characters in str1 and str2.

Note

This syntax is supported only in Stateflow^® charts that use C as the action language. In charts that use MATLAB as the action language, use strncmp.

Examples

Compare Strings in Charts That Use MATLAB as the Action Language

Return a value of 1 (true) because the strings are equal.

x = strcmp("Hello","Hello");

Return a value of 0 (false) because the strings are not equal.

y = strcmp("Hello","Hello!");

You can compare strings by using relational operators. Use == to determine if two strings are equal.

[str1 == str2]

Use ~= to determine if two strings are not equal.

[str1 ~= str2]

Compare Strings in Charts That Use C as the Action Language

Return a value of 0 because the strings are equal.

x = strcmp("Hello","Hello");

Return a nonzero value because the strings are not equal.

y = strcmp("Hello","Hello!");

You can compare strings by using relational operators. Use == to determine if two strings are equal.

[str1 == str2]

Use != or ~= to determine if two strings are not equal.

[str1 != str2]

Compare First N Characters of Strings

Return a value of 0 because the strings start with the same five characters.

z = strcmp("Hello","Hello!",5);

This syntax is supported only in Stateflow charts that use C as the action language. In charts that use MATLAB as the action language, use strncmp.

Input Arguments

str1, str2 — Input strings

string scalar

Input strings, specified as string scalars. In charts that use MATLAB as the action language, enclose literal strings with double quotes.

Example: "Hello"

n — Number of characters checked

positive integer

Number of characters checked, starting at the beginning of each string, specified as a positive integer.

Version History

Introduced in R2018b