There are a variety of string operations that can be performed. We shall go through each one of them in the future section. When you try to compile the code, it will compile however the compiler will throw a warning message as follows:.
Thus, it warns us that gets is a deprecated and dangerous function and should be hence avoided. Function: The function takes a single argument, i. Sort characters in a string in alphabetical order. Program in C to delete the vowels in a string. To extract one or all substrings of a string in C. Concatenating Strings in C.
Copying strings in C. Swap two Strings. Comparing Strings. Removing Blank Spaces from a string. Strings in c gets , fgets , getline , getchar , puts , putchar , strlen Written By - Pooja. Reading Strings: There are multiple methods using which a string can be read which has been entered by user. The main drawback of scanf to use to input string; is that the function terminates as soon as it finds a blank space.
Also note that, for scanning strings, you do not need the ampersand character precede the string name str. Null character gets automatically appended on encountering a blank space to mark the end of string.
Using gets function in C : Should no longer be used : Using gets , string can be read as follows: gets str ; gets overcomes the shortcomings of scanf. Gets stands for get string. The function takes starting address of the string which will hold the input and automatically appends the null character at the end of the string.
This function is deprecated — that means it is obsolete and it is strongly suggested we do not use it — because it is dangerous.
It is dangerous because it provides no protection against buffer overflow; overflowing the string into which it is saving data. Since it is sometimes used in older code which is why the GNU C Library still provides it , we need to understand how it is used.
The gets function takes one parameter, the string in which to store the data which is read. It reads characters from standard input up to the next newline character that is, when the user presses Enter button , discards the newline character, and copies the rest of the data into the string. If there was no error, it returns the same string ; otherwise, if there was an error, it returns a null pointer.
We shall see going ahead our first string operation example using gets. Rather than reading a string from standard input, fgets reads it from a specified stream, usually file stream up to and including a newline character.
It stores the string in the string variable passed to it, adding a null character to terminate the string. This function takes three parameters: the first is the string into which to read data, the second is the maximum number of characters to read.
The third parameter is the stream from which to read. The number of characters that fgets reads is one less than than number specified; it stores the null character in the last character space.
You must supply at least as many characters of space in the string, or your program might crash, but at least the fgets function protects against overflowing the string and creating a security hazard. If there is no error, fgets returns the string read as a return value else for example if the stream is already at end of file, it returns a null pointer.
Reading Multiple Words to Form a Line 1. To overcome this problem we can make different arrays for all the words present in the string. Reading Multiple Lines The following program reads multiple line from the keyboard. All of them are correct. What will be the length of array instr[] requires to store the string completely? As the word hello is 5 characters long and there will be a null character at end , we require an array of size 6.
Question State True or False : "The input function gets has one string parameter. The input function gets has one string parameter which reads characters from the keyboard until a new line character is encountered and then appends a null character to the string. Input character to replace and character new character from user, store it in some variables.
Iterate a loop from start of string str to end. Inside the loop, swap old character with new character and terminate the loop. Print result. C Program to check whether the Character is Alphabet or Not. C Program to Check Vowel or Consonant. C Program to Compare two Strings.
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