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C Programming in VS Code

Printing a message in C

Beginner's Guide to Keywords, Identifiers, Constants, Variables, Datatypes in C

Operators & Expressions in C

Input & Output Operations in C

Control Statements in C

Loops in C

Array in C

Character Array & Strings in C

User Defined Functions in C

Structure and Union in C

Pointers in C

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Character Array & Strings in C

Character Array: It is a sequence of characters that are considered as a single data item.

Common operations performed on character strings includes:

1) Reading and writing strings.

2) Combining strings.

3) Copying one string to another.

4) Extracting a portion of a string.

strcat function: strcat() is a C function that concatenates (joins) two strings together. It takes two parameters: the destination string and the source string, and appends the source string to the end of the destination string.

strcmp function: strcmp() is a C function that compares two strings lexicographically, and returns 0 if they are equal, <0 or >0 otherwise.

strcpy function: strcpy() is a C function that copies the contents of a string (including the null terminator) from a source to a destination. It takes two parameters: the destination string and the source string.

strlen function: strlen() is a C function that returns the length of a string, not including the null terminator. It takes a single parameter, a string, and returns an integer value.

strstr function: strstr() is a C function that searches for the first occurrence of a substring within a string, and returns a pointer to the substring. It takes two parameters: the string being searched and the substring being searched for. It returns a pointer to the first occurrence of the substring, or NULL if the substring is not found.

Character Array & Strings in C

Reading string:

reading_string.c


#include <stdio.h>

void main() {
    char string[10];
    printf("Enter a string(Press Enter at the end): ");
    scanf("%s", string);
    printf("\nYou entered: %s", string);
}

Reading line:

reading_line.c


#include <stdio.h>

void main() {
    char line[100], letter;
    int i = 0;
    printf("Enter a line of text (Press Enter at the end): ");
    do {
        letter = getchar();
        line[i] = letter;
        i++;
    } while(letter != '\n');
    line[i] = '\0';
    printf("\nYou entered:\t\t%s", line);
}

Copying one string to another:

copying_one_string_to_another.c


#include <stdio.h>

void main() {
    char string1[10], string2[10];
    int i = 10;
    printf("Enter a string (Press Enter at the end): ");
    scanf("%s",string1);
    for (i = 0; string1[i] != '\0'; i++)
        string2[i] = string1[i];
    string2[i] = '\0';
    printf("\nYou entered: %s\nTotal characters: %d", string2, i);
}

Writing string to screen:

writing_string_to_screen.c


#include <stdio.h>

void main() {
    char string[20] = "Like and Share";
    printf("\nDo %s this video along with playlist.\n", string);
}

Putting strings together:

putting_strings_together.c


#include <stdio.h>

void main() {
    char string1[20] = "Customized", string2[5] = "Dev", string3[25];
    int i, j;
    for(i = 0; string1[i] != '\0'; i++)
        string3[i] = string1[i];
    string3[i] = ' ';
    for(j = 0; string2[j] != '\0'; j++)
        string3[i + j + 1] = string2[j];
    string3[i + j + 1] = '\0';
    printf("\nString1: %s\tString2: %s\tCombined String: %s", string1, string2, string3);
}

Comparing two strings:

compairing_two_strings.c


#include <stdio.h>

void main() {
    char string1[10] = "String1", string2[10] = "String2";
    int i =0;
    while(string1[i] == string2[i] && string1[i] != '\0' && string2[i] != '\0')
        i++;
    if(string1[i] == '\0' && string2[i] == '\0')
        printf("\nBoth String are Equal.");
    else
        printf("\nBoth String are Not Equal.");
}

Concating two strings:

concating_two_strings.c


#include <stdio.h>
#include <string.h>

void main() {
    char string1[15] = "Press Like", string2[10] = " & Share";
    printf("\n%s this video.\n", strcat(string1, string2));
}

Compairing two strings using strcmp:

compairing_two_strings_using_strcmp.c


#include <stdio.h>
#include <string.h>

void main() {
    char string1[10] = "String", string2[10] = "String";
    int compare_value;
    compare_value = strcmp(string1, string2);
    if(compare_value == 0)
        printf("\nBoth string are equal.\n");
    else
        printf("\nBoth string are not equal.\n");
}

Copying one string to another using strcpy:

copying_one_string_to_another_using_strcpy.c


#include <stdio.h>
#include <string.h>

void main() {
    char string1[100] = "This is original text but soon it will be copied.", string2[100];
    strcpy(string2, string1);
    printf("\nOriginal Text: %s\nCopied Text: %s\n", string1, string2);
}

Finding the length of string:

finding_string_length.c


#include <stdio.h>
#include <string.h>

void main() {
    char string[20] = "Customized Dev";
    printf("\nString: %s\nTotal characters: %lu\n", string, strlen(string));
}

Finding the substring:

finding_substring.c


#include <stdio.h>
#include <string.h>

void main() {
    char string1[10] = "customize", string2[10] = "custom";
    if(strstr(string1, string2) == NULL)
        printf("\nSubstring not found.\n");
    else
        printf("\nString2 is substring of String1.\n");
}