0x05-pointers_arrays_strings

0x05. C - More pointers, arrays and strings

Exercises

0-strcat.c

Write a function that concatenates two strings.

• Prototype: char *_strcat(char *dest, char *src);
• This function appends the src string to the dest string, overwriting the terminating null byte (\0) at the end of dest, and then adds a terminating null byte
• Returns a pointer to the resulting string dest

1-strncat.c

Write a function that concatenates two strings.

• Prototype: char *_strncat(char *dest, char *src, int n);
• The _strncat function is similar to the _strcat function, except that it will use at most n bytes from src; and src does not need to be null-terminated if it contains n or more bytes
• Return a pointer to the resulting string dest

2-strncpy.c

Write a function that copies a string.

• Prototype: char *_strncpy(char *dest, char *src, int n);
• Your function should work exactly like strncpy

3-strcmp.c

Write a function that compares two strings.

• Prototype: int _strcmp(char *s1, char *s2);

4-rev_array.c

I am a kind of paranoid in reverse. I suspect people of plotting to make
me happy mandatory
Write a function that reverses the content of an array of integers.

• Prototype: void reverse_array(int *a, int n);
• Where n is the number of elements of the array

5-string_toupper.c

Always look up
Write a function that changes all lowercase letters of a string to uppercase.

• Prototype: char *string_toupper(char *);

6-cap_string.c

Expect the best. Prepare for the worst. Capitalize on what comes
Write a function that capitalizes all words of a string.

• Prototype: char *cap_string(char *);
• Separators of words: space, tabulation, new line, ,, ;, ., !, ?, ", (, ), {, and }"

7-leet.c

Mozart composed his music not for the elite, but for everybody
Write a function that encodes a string into 1337.

• Letters a and A should be replaced by 4
• Letters e and E should be replaced by 3
• Letters o and O should be replaced by 0
• Letters t and T should be replaced by 7
• Letters l and L should be replaced by 1
• Prototype: char *leet(char *);
• You can only use one if in your code
• You can only use two loops in your code
• You are not allowed to use switch
• You are not allowed to use any ternary operation

8-rot13.c

Write a function that encodes a string using rot13.

• Prototype: char *rot13(char *);
• You can only use if statement once in your code
• You can only use two loops in your code
• You are not allowed to use switch
• You are not allowed to use any ternary operation