returningpointers.cpp

来自「压缩包里有教材<<C++模式设计-基于QT4开源跨平台开发框架&gt」· C++ 代码 · 共 39 行

/**
   This example shows the
   mehanics of passing arrays to functions,
   and returning them by pointer
*/

#include <assert.h>

int paramSize;

void bar(int *integers) {
    integers[2]=3; /* Change the third element in the incoming array. */
}

int* foo(int arrayparameter[]) {
    using namespace std;
    paramSize = sizeof(arrayparameter);
    bar(arrayparameter); /* Pass an array by pointer to a function. */
    return arrayparameter; /* Return an array as a pointer from a function. */
}
    
int main(int argc, char** argv) {
    int intarray2[40] = {9,9,9,9,9,9,9,2,1};
    char chararray[20] = "Hello World"; /* special syntax for initializing char array */
    int intarray1[20]; /* uninitialized memory */
    int* retval;  /* uninitialized pointer */

//  intarray1 = foo(intarray2); /* error, intarray1 is like a char* const, it cannot be assigned to. */

    retval = foo(intarray2);
    assert (retval[2] == 3);
    assert (retval[2] = intarray2[2]);
    assert (retval == intarray2);
    int refSize = getSize(intarray2);
    assert(refSize == paramSize);
    return 0;
}