Back-End Programming Exam > Back-End Programming Videos > Learn to Program with C++: Beginner to Expert > C++ Programming Tutorials - string Substrings; swapping; and finding
C++ Programming Tutorials - string Substrings; swapping; and finding Video Lecture | Learn to Program with C++: Beginner to Expert - Back-End Programming
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73 videos|7 docs|23 tests
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FAQs on C++ Programming Tutorials - string Substrings; swapping; and finding Video Lecture - Learn to Program with C++: Beginner to Expert - Back-End Programming
| 1. What are substrings in C programming and how can they be used? |  |
Ans. Substrings in C programming refer to a smaller portion of a larger string. They can be extracted by specifying the starting index and length of the desired substring using the `substr` function. For example, `substr(string, start_index, length)` will return a substring of `string` starting from `start_index` and having a length of `length`.
| 2. How can I swap two strings in C programming? | |
Ans. To swap two strings in C programming, you can use the `strcpy` function to temporarily store one string, then copy the second string to the first, and finally copy the temporarily stored string to the second. Here's an example:
```c
char temp[100];
strcpy(temp, string1);
strcpy(string1, string2);
strcpy(string2, temp);
```
| 3. How can I find the back-end programming language of a website using C programming? | |
Ans. It is not possible to directly determine the back-end programming language of a website using C programming. The programming language used for the back-end is usually determined by the server-side technology employed (e.g., PHP, Python, Ruby, etc.), and this information is not readily available through C programming alone.
| 4. How can I check if a string contains a specific substring in C programming? | |
Ans. To check if a string contains a specific substring in C programming, you can use the `strstr` function. It searches for the first occurrence of the specified substring within the given string and returns a pointer to the beginning of the substring if found, otherwise it returns NULL. Here's an example:
```c
char string[] = "Hello, World!";
char substring[] = "World";
if (strstr(string, substring) != NULL) {
printf("Substring found!\n");
} else {
printf("Substring not found!\n");
}
```
| 5. How can I count the occurrences of a specific character in a string using C programming? | |
Ans. To count the occurrences of a specific character in a string using C programming, you can iterate through each character of the string and compare it with the desired character. If they match, increment a counter variable. Here's an example:
```c
char string[] = "Hello, World!";
char character = 'l';
int count = 0;
for (int i = 0; i < strlen(string); i++) {
if (string[i] == character) {
count++;
}
}
printf("The character '%c' occurs %d times in the string.\n", character, count);
```
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Oct 24, 2024 Last updated |
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