The function used to find the first occurrence of a given string in another string is `strstr()` in C and PHP, `indexOf()` in JavaScript and Java, and `find()` in Python.

Here is a step by step guide on how to use these functions:

1. C and PHP: `strstr()`
- Syntax: `char *strstr(const char *haystack, const char *needle)`
- This function takes two strings as arguments: the main string (haystack) and the substring (needle) you want to find. It returns a pointer to the first occurrence of the substring in the main string.

2. JavaScript and Java: `indexOf()`
- Syntax: `str.indexOf(searchValue[, fromIndex])`
- This method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex. Returns -1 if the value is not found.

3. Python: `find()`
- Syntax: `str.find(sub[, start[, end]])`
- This method returns the lowest index of the substring (if found). If not found, it returns -1. You can also specify where to start and end the search.

Question

The function used to find the first occurrence of a given string in another string is `strstr()` in C and PHP, `indexOf()` in JavaScript and Java, and `find()` in Python.

Here is a step by step guide on how to use these functions:

1. C and PHP: `strstr()`
   - Syntax: `char *strstr(const char *haystack, const char *needle)`
   - This function takes two strings as arguments: the main string (haystack) and the substring (needle) you want to find. It returns a pointer to the first occurrence of the substring in the main string.

2. JavaScript and Java: `indexOf()`
   - Syntax: `str.indexOf(searchValue[, fromIndex])`
   - This method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex. Returns -1 if the value is not found.

3. Python: `find()`
   - Syntax: `str.find(sub[, start[, end]])`
   - This method returns the lowest index of the substring (if found). If not found, it returns -1. You can also specify where to start and end the search.

Knowee AI · Accepted Answer

The function used to find the first occurrence of a given string in another string is `strstr()` in C and PHP, `indexOf()` in JavaScript and Java, and `find()` in Python.

Here is a step by step guide on how to use these functions:

1. C and PHP: `strstr()`
   - Syntax: `char *strstr(const char *haystack, const char *needle)`
   - This function takes two strings as arguments: the main string (haystack) and the substring (needle) you want to find. It returns a pointer to the first occurrence of the substring in the main string.

2. JavaScript and Java: `indexOf()`
   - Syntax: `str.indexOf(searchValue[, fromIndex])`
   - This method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex. Returns -1 if the value is not found.

3. Python: `find()`
   - Syntax: `str.find(sub[, start[, end]])`
   - This method returns the lowest index of the substring (if found). If not found, it returns -1. You can also specify where to start and end the search.

Which of the following function is used to find the first occurrence of a given string in another string

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