I was dizzy by a C program today, and finally found out that I made a low-level mistake. It's all because of "object-oriented" for a few years, and I forgot the old capital of C.
Summarize the error as follows:
C language is different from C++. In C programming, all variables and constants that may be used in the function/procedure must be defined at the beginning of the function/procedure, because the division of memory addresses in C language is under DOS. Instead of the current segment page method, c first opens up the data segment in memory, and then opens the code segment.
| For example: #include <stdio.h> void main() { int a=10; printf("%d/n",a); int b=8; printf("%d/n",b); } in There will be errors under TC2.0. Put the declaration of b in front. #include <stdio.h> void main() { int a=10; int b=8; printf("%d/n",a) ; printf("%d/n",b); } |