How to Concatenate Strings in Array in C - Step by Step Examples

How to Concatenate Strings in Array in C ?

Answer

To concatenate strings in an array in C, you can use a loop to iterate over the array and use the strcat function from the string.h library to concatenate each string to a result string.


✐ Examples

1 Concatenate All Strings in an Array

In this example,

  1. We create an array of strings named arr.
  2. We define a variable n to specify the number of elements in the array.
  3. We create a result string result and initialize it with an empty string.
  4. We use a loop to iterate over each string in the array.
  5. In each iteration, we use the strcat function to concatenate the current string to result.
  6. Finally, we print the concatenated result.

C Program

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

void concatenateStrings(char arr[][100], int n, char *result) {
    for (int i = 0; i < n; i++) {
        strcat(result, arr[i]);
    }
}

int main() {
    char arr[][100] = {"Hello", " ", "World", "!"};
    int n = sizeof(arr) / sizeof(arr[0]);
    char result[400] = ""; // Ensure the result array is large enough
    concatenateStrings(arr, n, result);
    printf("Concatenated string: %s\n", result);
    return 0;
}

Output

Concatenated string: Hello World!

2 Concatenate Strings from Another Array

In this example,

  1. We create another array of strings named arr.
  2. We define a variable n to specify the number of elements in the array.
  3. We create a result string result and initialize it with an empty string.
  4. We use a loop to iterate over each string in the array.
  5. In each iteration, we use the strcat function to concatenate the current string to result.
  6. Finally, we print the concatenated result.

C Program

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

void concatenateStrings(char arr[][100], int n, char *result) {
    for (int i = 0; i < n; i++) {
        strcat(result, arr[i]);
    }
}

int main() {
    char arr[][100] = {"Good", " ", "Morning", ", ", "everyone!"};
    int n = sizeof(arr) / sizeof(arr[0]);
    char result[400] = ""; // Ensure the result array is large enough
    concatenateStrings(arr, n, result);
    printf("Concatenated string: %s\n", result);
    return 0;
}

Output

Concatenated string: Good Morning, everyone!

Summary

In this tutorial, we learned How to Concatenate Strings in Array in C language with well detailed examples.


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