C Programming String Functions
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Questions and Answers

What does the function strcat(dest, src) do?

  • Compares two strings and returns 0 if equal
  • Copies the string `src` to `dest`
  • Returns a pointer to the first occurrence of character `c` in `str`
  • Concatenates `src` to the end of `dest` (correct)
  • What is the purpose of the strupr(str) function?

  • Converts a string to lowercase
  • Reverses a string
  • Converts a string to uppercase (correct)
  • Returns the length of the string
  • Which function is used to compare two strings?

  • strcat
  • strcpy
  • strupr
  • strcmp (correct)
  • What is the result of the code sprintf(str, "Hello, %s!", "World")?

    <p>Hello, World!</p> Signup and view all the answers

    What is the purpose of the strrev(str) function?

    <p>Reverses a string</p> Signup and view all the answers

    Study Notes

    String Functions

    • Library: ``
    • Functions:
      • strlen(str): returns the length of the string
      • strcpy(dest, src): copies the string src to dest
      • strcat(dest, src): concatenates src to the end of dest
      • strcmp(str1, str2): compares two strings, returns 0 if equal
      • strchr(str, c): returns a pointer to the first occurrence of character c in str
      • strstr(str1, str2): returns a pointer to the first occurrence of str2 in str1

    String Manipulation

    • Functions:
      • strupr(str): converts a string to uppercase
      • strlwr(str): converts a string to lowercase
      • strupr(str): converts the first character of a string to uppercase
      • strrev(str): reverses a string
    • Note: These functions are not part of the standard `` library, but are commonly used in string manipulation.

    String Concatenation

    • Using strcat():
      • strcat(str1, str2): concatenates str2 to the end of str1
      • Example: strcat("Hello, ", "World!") results in "Hello, World!"
    • Using array indexing:
      • Example: char str[20]; strcpy(str, "Hello"); str[5] = ','; strcat(str, " World!"); results in "Hello, World!"
    • Using sprintf():
      • sprintf(str, "format string", arguments): formats a string using the format string and arguments
      • Example: sprintf(str, "Hello, %s!", "World") results in "Hello, World!"

    String Functions

    • strlen(str) returns the length of the string.
    • strcpy(dest, src) copies the string src to dest.
    • strcat(dest, src) concatenates src to the end of dest.
    • strcmp(str1, str2) compares two strings and returns 0 if they are equal.
    • strchr(str, c) returns a pointer to the first occurrence of character c in str.
    • strstr(str1, str2) returns a pointer to the first occurrence of str2 in str1.

    String Manipulation

    • strupr(str) converts a string to uppercase.
    • strlwr(str) converts a string to lowercase.
    • strupr(str) converts the first character of a string to uppercase.
    • strrev(str) reverses a string.
    • Note: These functions are not part of the standard library, but are commonly used in string manipulation.

    String Concatenation

    • strcat(str1, str2) concatenates str2 to the end of str1.
    • Example: strcat("Hello, ", "World!") results in "Hello, World!".
    • Concatenation using array indexing: Example: char str; strcpy(str, "Hello"); str[5] = ','; strcat(str, " World!"); results in "Hello, World!".
    • sprintf(str, "format string", arguments) formats a string using the format string and arguments.
    • Example: sprintf(str, "Hello, %s!", "World") results in "Hello, World!".

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    Description

    This quiz covers the string functions in C programming, including strlen, strcpy, strcat, strcmp, strchr, and strstr. Test your knowledge of string manipulation in C.

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