Data argument not used by format strings in C
Format string specifiers for printf use % to denote the start of a format specifier, not &.
c
What is the use of intptr_t?
The primary reason, you cannot do bitwise operation on a void *, but you can do the same on a intptr_t. On many occassion, where you need to perform bitwise operation on an address, you can use intptr_t. However, for bitwise operations, best approach is to use the unsigned counterpart, uintptr_t. As mentioned in the … Read more
How to printf a memory address in C
Use the format specifier %p: The standard requires that the argument is of type void* for %p specifier. Since, printf is a variadic function, there’s no implicit conversion to void * from T * which would happen implicitly for any non-variadic functions in C. Hence, the cast is required. To quote the standard: 7.21.6 Formatted … Read more
“…redeclared as different kind of symbol”?
It says that low and high are “redeclared as different type of symbol” and I don’t know what that means. Basically, all I’m doing here (READ: trying) is integrating from low (which I set to 0) to high (20) to find the Riemann sum. The for loop looks kinda trippy too…I’m so lost. EDIT: ^That … Read more
C char* to int conversion
atoi can do that for you Example:
I’m getting “Invalid Initializer”, what am I doing wrong?
You can’t initialise revS in that manner, you need a very specific thing to the right of the =. From C11 6.7.9 Initialization /14, /16: 14/ An array of character type may be initialized by a character string literal or UTF−8 string literal, optionally enclosed in braces. Successive bytes of the string literal (including the … Read more
How to use timer in C?
You can use a time_t struct and clock() function from time.h. Store the start time in a time_t struct by using clock() and check the elapsed time by comparing the difference between stored time and current time.
strcmp not working
You want to do this: strcmp(buffer, “exit\n”) That is, when you enter your string and press “enter”, the newline becomes a part of buffer. Alternately, use strncmp(), which only compares n characters of the string
Typedef function pointer?
typedef is a language construct that associates a name to a type.You use it the same way you would use the original type, for instance using them like As you can see, you could just replace the typedefed name with its definition given above. The difficulty lies in the pointer to functions syntax and readability … Read more
Initialization from incompatible pointer type warning when assigning to a pointer
&arr gives an array pointer, a special pointer type int(*)[5] which points at the array as whole. arr, when written in an expression such a int *q = arr;, “decays” into a pointer to the first element. Completely equivalent to int *q = &arr[0]; In the first case you try to assign a int(*)[5] to … Read more