我有一些C代碼,我不太清楚發生了什麼。不知道這段代碼是怎麼回事
#include <stdio.h>
#include <stdlib.h>
#define DIM1 7
#define DIM2 5
#define RES_SIZE 1000
typedef double stackElementT;
typedef struct {
stackElementT *contents;
int maxSize;
int top;
int min2;
} stackT;
void StackInit(stackT *stackP, int maxSize) {
stackElementT *newContents;
newContents = (stackElementT *)malloc(sizeof(stackElementT)*maxSize);
if (newContents == NULL) {
fprintf(stderr, "Not enough memory.\n");
exit(1);
}
stackP->contents = newContents;
stackP->maxSize = maxSize;
stackP->top = -1;
}
void StackDestroy(stackT *stackP) {
free(stackP->contents);
stackP->contents = NULL;
stackP->maxSize = 0;
stackP->top = -1;
}
int StackIsEmpty(stackT *stackP) { return stackP->top < 0; }
int StackIsFull(stackT *stackP) { return stackP->top >= stackP->maxSize-1; }
void StackPush(stackT *stackP, stackElementT element) {
if(StackIsFull(stackP)) {
fprintf(stderr, "Can't push element: stack is full.\n");
exit(1);
}
stackP->contents[++stackP->top] = element;
}
stackElementT StackPop(stackT *stackP) {
if(StackIsEmpty(stackP)) {
fprintf(stderr, "Can't pop element: stack is empty.\n");
exit(1);
}
return stackP->contents[stackP->top--];
}
int shell(char* s1, int arg) {
printf("> ");
scanf("%s %d%*c", &s1, &arg);
return arg;
}
int main() {
char cmds[DIM1][DIM2] = {{"push"}, {"pop"}, {"add"}, {"ifeq"}, {"jump"}, {"print"}, {"dup"}};
char* s1; int arg;
arg = shell(s1, arg);
printf("%s\n", &s1);
}
輸入:push 4
。它打印J+
而不是「推」,但通常打印4
。
同時還提供了編譯這些警告:
stack.c: In function ‘shell’:
stack.c:60: warning: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘char **’
stack.c: In function ‘main’:
stack.c:71: warning: format ‘%s’ expects type ‘char *’, but argument 2 has type ‘char **’
stack.c:65: warning: unused variable ‘cmds’
stack.c:69: warning: ‘arg’ is used uninitialized in this function
可有人請解釋一下嗎?
不是。上面有一個小堆棧實現,但我想沒有人想要通過它。 – tekknolagi
謝謝,正在工作...... –
有沒有這個代碼的意圖,或者你只是問在執行時什麼是邏輯流程?因爲我沒有看到main()中調用的堆棧代碼的任何內容,只是進行掃描和打印...... – donnyton