Entrance Exams
Govt. Exams
Both syntax forms are valid in C. Elements can be provided in nested braces or as a linear list, and they fill row by row.
int arr[5];
for(int i=0; i
Array values: arr[0]=0, arr[1]=1, arr[2]=4, arr[3]=9, arr[4]=16. Output is 1 4 16.
Linear search on unsorted array requires checking each element in worst case, giving O(n) time complexity.
char str[20];
strcpy(str, "Competitive");
strcat(str, " Exam");
printf("%s", str);
strcpy copies "Competitive" to str. strcat appends " Exam" to it, resulting in "Competitive Exam".
ptr[2] is equivalent to *(ptr+2), which points to the third element (index 2) of the array.
\0 is the null terminator which marks the end of a string. %s stops printing at the first null character.
int arr[] = {10, 20, 30};
printf("%d", sizeof(arr)/sizeof(arr[0]));
sizeof(arr) gives total bytes of array. sizeof(arr[0]) gives bytes of one element. Division gives number of elements: 3.
There is no standard library function for string reversal. strrev() is non-standard (available in some compilers). Manual reversal or custom functions are needed.
char[] creates a modifiable array with its own storage. char* points to read-only string literal in memory.
char str[] = "Code";
printf("%c", str[2]);
String "Code" has indices: C(0), o(1), d(2), e(3). str[2] refers to 'd'.