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分享【C语言求助】
（本代码目的是将输入的字符换成后面第四个字母，China——>Glmre，前面那段代码是并列执行的，便于让各位看到结果的差异，即口Glmre）
问题描述：
当独立执行第二段代码时输出：Glmre
当和第一段代码并列执行时输出：口Glmr
#include <math.h>
#include <stdio.h>
int main(void)
{
//以下为并列的代码，不是主要问题
{
printf("hw 3.2\n");
float way,temp;
printf("请输入金额：\n");
scanf("%f",&temp);
printf("请输入存款方式(1-5)：\n");
scanf("%f",&way);
if(way==1)
{
temp*=(1+5*0.03);
printf("result= %f \n\n",temp);
}
else if(way==2)
{
temp*=(1+2*0.021);
temp*=(1+3*0.0275);
printf("result= %f \n\n",temp);
}
else if(way==3)
{
temp*=(1+3*0.0275);
temp*=(1+2*0.021);
printf("result= %f \n\n",temp);
}
else if(way==4)
{
temp*=pow(1.015,5);
printf("result= %f \n\n",temp);
}
else
{
temp*=pow(1+0.0035/4,20);
printf("result=%f \n\n",temp);
}
}
//以下为提问的代码
{
printf("hw 3.6\n");
printf("请输入五位数密码：\n");
char c[5];
int i;
for(i=0;i<5;i++) //for循环输入多个字符
{
c[i]=getchar(); //将输入的字符赋给变量
}
for(i=0;i<5;i++)
{
c[i]=c[i]+4; //将输入的字符换成后面第四个
c[5]='\0';
putchar(c[i]);
}
putchar('\n');
}
}
请大家帮忙看看是哪的问题，谢谢！
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源代码大师 2021-05-03
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C和C++完整教程:https://blog.csdn.net/it_xiangqiang/category_10581430.html
C和C++算法完整教程:https://blog.csdn.net/it_xiangqiang/category_10768339.html
自信男孩 2021-03-08
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#define FILE_NAME_LEN 32
#define MAX_KEY_NUM 26
enum {
ENCRYPT_DATA = 1,
DECRYPT_DATA,
FORCE_DECRYPT_DATA,
EXIT_PROCESS
};
/*加密函数，把字符向右循环移位n*/
char encrypt(char ch, int n)
{
while(ch >= 'A' && ch <= 'Z') {
return ('A'+(ch-'A'+n)%26);
}
while(ch >= 'a' && ch <= 'z') {
return ('a'+(ch-'a'+n)%26);
}
return ch;
}
/*菜单，1.加密，2.解密，3.暴力破解，密码只能是数字*/
static void menu(void)
{
printf("\n=========================================================");
printf("\n1.Encrypt the file");
printf("\n2.Decrypt the file");
printf("\n3.Force decrypt file");
printf("\n4.Quit\n");
printf("=========================================================\n");
return;
}
static int get_opt(void)
{
int option, ret;
printf("Please input your choice: ");
ret = scanf("%d", &option);
while (ret != 1) {
printf("Please input your choice: ");
ret = scanf("%d", &option);
}
return option;
}
/* Open a file, then return file decription. */
static FILE *open_file(const char *filename, const char *openmode)
{
FILE *fp = NULL;
fp = fopen(filename, openmode);
if(!fp) {
printf("Can not open the outfile: %s, %s!\n", filename, strerror(errno));
exit(0);
}
return fp;
}
/* Copy data from source file to destination file. */
int copy_data(FILE *src_fp, FILE *dst_fp, int key)
{
int data, cnt = 0;
while(!feof(src_fp)) { /* 加密 */
data = encrypt(fgetc(src_fp), key);
if (data != EOF) {
putchar(data);
fputc(data, dst_fp);
cnt++;
}
}
return cnt;
}
int main(int argc, const char *argv[])
{
char src_file[FILE_NAME_LEN];
char dst_file[FILE_NAME_LEN];
FILE *src_fp, *dst_fp;
int option, key, ret;
int total_num, i;
while (1) {
menu();
option = get_opt();
if (option == EXIT_PROCESS) {
printf("Goodbye!\n");
break;
}
printf("Please input src file: ");
scanf("%s", src_file);
src_fp = open_file(src_file, "r");
if (!src_fp)
return 1;
printf("Please input dst file: ");
scanf("%s", dst_file);
dst_fp = open_file(dst_file, "w");
if (!dst_fp) {
fclose(src_fp);
return 1;
}
if (option != FORCE_DECRYPT_DATA) {
printf("Please input the key: ");
ret = scanf("%d", &key);
while (ret != 1) {
printf("Please input the key: ");
ret = scanf("%d", &key);
}
}
switch (option) {
case ENCRYPT_DATA:
total_num = copy_data(src_fp, dst_fp, key);
printf("Encrypt %d character(s)\n", total_num);
fclose(src_fp);
fclose(dst_fp);
break;
case DECRYPT_DATA:
key = 26 - key;
total_num = copy_data(src_fp, dst_fp, key);
printf("Encrypt %d character(s)\n", total_num);
fclose(src_fp);
fclose(dst_fp);
break;
case FORCE_DECRYPT_DATA:
for (i = 1; i < MAX_KEY_NUM; i++) {
fseek(src_fp, 0l, SEEK_SET);
fseek(dst_fp, 0l, SEEK_SET);
total_num = copy_data(src_fp, dst_fp, 26-i);
printf("Current encrypt's key is %d\n", i);
printf("Encrypt %d character(s)\n", total_num);
printf("Press 'Q' to quit and other key to continue......\n");
option = getchar();
if (option == 'Q' || option == 'q') {
break;
}
}
fclose(src_fp);
fclose(dst_fp);
break;
}
printf("\nEncrypt is over!\n");
}
return 0;
}
供参考～
paena 2021-03-08
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再读密码循环前，再加个getchar()，把前面的回车读掉，用getchar()都要注意这个问题。
自信男孩 2021-03-08
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看不懂
不过还是谢谢啦！[/quote]只看加密和解密部分吧，其他的不用考虑～
飞禽走兽卍一2b 2021-03-08
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看不懂不过还是谢谢啦！
不过还是谢谢啦！飞禽走兽卍一2b 2021-03-08
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[/quote]
谢谢！现在知道了
qzjhjxj 2021-03-06
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