C++ string

C++ string

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  C++ PROGRAM STRING BY:B.DHEENADAYALAN
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  STRING String is asequence of character or collection of character or array of Character. CHARACTER: ★ It represent a single letter within the single codes. ★ Example: ‘h’,’e’,’l’,’l’,’o’. STRING: ★ It represent a collection of character within double codes. ★ Example:”hello”.
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  TYPES OF DECLARATION: C++provides following two types of string representations: ● The C-style character string. ● The string class type introduced with Standard c++ C STYLE DECLARATION SYNTAX: ● char string_name [size of the string]; STANDARD C++ DECLARATION SYNTAX: ● string name[size of the string];
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  INITIALIZATION: ● Using singlecharacter constant eg: string s1={‘h’,’e’,’l’,’l’,’o’,’0’}; ● Using string constant eg: string s2={“hello”}; ● String s3=s2; copy initialization ● String s4(s1); direct initialization ● String s5(6,’d’); concatenates ● String s6; cout<<”enter the string”; cin>>s6; cout<<”you entered”<<s6; string was choosed by the user.
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  ● length =s6.size(); cout<<length; to identify the size. Memory Presentation : ●
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  SOME OF THEFUNCTION AND 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); Returns the length of string s1. 4. strcmp(s1, s2); Returns 0 if s1 and s2 are the same; less than 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.
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  THANK YOU!