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Waiting X number of minutes
My question is similiar to the one recently posted about waiting for x milliseconds. I have an idea of how to make a program wait for X minutes, but I would like to hear others opinions or suggestions about how to do this. The following function works, but it continously has the processor... -
how to use NAN
Hi For the purposes of debugging a program, I would like to be able to ask whether a (double) variable has the value NAN (not a number). My question how do I check if x == NAN ? For example: #include <stdio.h> #include <math.h> int main() { double x; x = sqrt(-1.0); printf("x =... -
B = &A[0][0]; ??? if A is dynamically allocated
I would like to have a 1D pointer point to a M by N 2D dynamically allocated array. If the 2D is a constant array, everything works fine: main() { int i, j; double *b, A[3][2]; for (i = 0; i < 3; i++) for (j = 0; j < 2; j++) A[i][j] = 1.0; b = &A[0][0]... -
mem allocation inside function
I would like to pass a pointer to a function and have it allocate mememory for this pointer inside the function. #include <stdio.h> #include <stdlib.h> void f (double **A); main() { double *A; f(A); /*or f(&A) ?? */ } void f (double **A) { A = malloc(10*sizeof(double*) )...
