char* cstr; int c = snprintf( NULL, 0, "%d * %d = %d", tmp, tmp, tmp*tmp ); cstr = new char[ c + 1 ]; snprintf( cstr, c + 1, "%d * %d = %d", tmp, tmp, tmp*tmp );
基本型態與跟指標的大小，結論就是sizeof(任意型態的指標)都是8bytes
printf("char : %d\n", sizeof(char)); //輸出1
printf("char*: %d\n", sizeof(char *)); //輸出8 (我用64bit的OS，因此address是8byte)
printf("int : %d\n", sizeof(int)); //輸出1
printf("int* : %d\n", sizeof(int *)); //輸出8 (我用64bit的OS，因此address是8byte)
