088.批量计算数学题
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int
f_calc(int p_v1, char p_sign, int p_v2) {
switch (p_sign) {
case
'+':
return p_v1 + p_v2;
case '-':
return p_v1 - p_v2;
case
'*':
return p_v1 * p_v2;
case '/': //这个地方有一个致命的地方
if (!p_v2)
{
return -1;
}
else {
return p_v1 /
p_v2;
}
}
}
void main() {
FILE* l_fp_read = fopen("1.txt",
"r");
if (!l_fp_read)
{
printf("打开读文件失败!\n");
system("pause");
return;
}
int l_last_position = NULL;
char
l_read_line[50] = { NULL };
char l_write_line[50] = { NULL };
int *
p_save = NULL;
int l_count = NULL;
while (!feof(l_fp_read))
{
fgets(l_read_line, sizeof(l_read_line), l_fp_read);
int
l_this_position = ftell(l_fp_read);
if (l_this_position != l_last_position)
{
l_last_position = l_this_position;
int l_v1, l_v2;
char
l_sign;
int l_result;
sscanf(l_read_line, "%d%c%d=", &l_v1,
&l_sign, &l_v2);
l_result = f_calc(l_v1, l_sign,
l_v2);
sprintf(l_write_line, "%d%c%d=%d\n", l_v1, l_sign, l_v2,
l_result);
//在C语言中,只要是系统内置的函数,如果里面包含scanf这个关键字.
//你一定要使用取地址符号才能正常使用.
l_count++;
p_save
= (int *)realloc(p_save, l_count*sizeof(int));
int l_sizecount =
strlen(l_write_line) + 1;
p_save[l_count - 1] = (int)calloc(l_sizecount,
sizeof(char));
strcpy((char *)p_save[l_count - 1],
l_write_line);
}
}
FILE* l_fp_write = fopen("1.txt", "w");
if
(!l_fp_write)
{
printf("打开写文件失败!\n");
system("pause");
return;
}
for
(size_t i = 0; i < l_count; i++) {
fputs((char *)p_save[i],
l_fp_write);//ctrl+J
free((char *)p_save[i]);
}
free(p_save);
fclose(l_fp_read);
printf("\n自动答题工作完成\n");
system("pause");
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int count (int one, int tow, char symbol) {
switch (symbol) {
case '+':
return one + tow;
case '-':
return one - tow;
case '*':
return one * tow;
case '/':
if (!tow) {
return 0;
}
else { return one / tow; }
}
}
void main() {
FILE*read = fopen("1.txt", "r");
if (!read) {
printf("文件为空");
system("pause");
return;
}
int kong = NULL;
char pp[50] = { NULL };
char bb[50] = { NULL };
int *shenqing=NULL;
int counter = NULL;
while (!feof(read)) {
fgets(pp, sizeof(pp), read);
int shaomiao = ftell(read);
if (shaomiao != kong) {
int one; int tow; char symbol;
sscanf(pp, "%d%c%d=",&one, &symbol, &tow);
int result=count(one, tow, symbol);
sprintf(bb, "%d%c%d=%d\n", one, symbol, tow, result);
counter++;
shenqing = (int*)realloc(shenqing, counter*sizeof(int));
int cc = strlen(bb)+1;//加是因为1+1=\n\NULL,NULL是结束标志
shenqing[counter - 1] = (int)calloc(cc, sizeof(char));
strcpy((char*)shenqing[counter - 1], bb);
}
}
FILE*write = fopen("1.txt", "w");
for (size_t i = 0; i < counter; i++)
{
fputs((char*)shenqing[i], write);
free((char*)shenqing[i]);
}
free(shenqing);
fclose(read);
system("pause");
}