C 字符串比较差异(适用于某些情况,有时不适用)
我使用以下代码测试了我收到的电子邮件文件中的一些文本检测C 字符串比较差异(适用于某些情况,有时不适用),c,arrays,string,pointers,strcmp,C,Arrays,String,Pointers,Strcmp,我使用以下代码测试了我收到的电子邮件文件中的一些文本检测 #include <stdio.h> int main() { int max_size = 100; char email[100] ="aheanstring4strinstringzil.comg"; int pointer = 0; int i = 1; int j = 0; int len = 0; int chk = 0; char found1[7] = "string1";
#include <stdio.h>
int main()
{
int max_size = 100;
char email[100] ="aheanstring4strinstringzil.comg";
int pointer = 0;
int i = 1;
int j = 0;
int len = 0;
int chk = 0;
char found1[7] = "string1";
char found2[7] = "string2";
char found3[7] = "string3";
char found4[7] = "string4";
char found5[7] = "string5";
char user1[7] = "string1"; // 23
char user2[7] = "string2";// 19
char user3[7] = "string3"; // 14
char user4[7] = "string4"; // 16
char user5[7] = "string5";; // 15
while (pointer != max_size && chk != 1)
{
for (j = 0;j<7; j++)
{
found1[j] = *(email+pointer+j);
}
if (strcmp(found1, user1) == 0){
printf("Authorized User Found\n");
chk = 1;
continue;
}
for (j = 0;j<7; j++)
{
found2[j] = *(email+pointer+j);
}
if (strcmp(found2, user2) == 0){
printf("Authorized User Found\n");
chk = 1;
continue;
}
for (j = 0;j<7; j++)
{
found3[j] = *(email+pointer+j);
}
if (strcmp(found3, user3) == 0){
printf("Authorized User Found\n");
chk = 1;
continue;
}
for (j = 0;j<7; j++)
{
found4[j] = *(email+pointer+j);
}
if (strcmp(found4, user4) == 0){
printf("Authorized User Found\n");
chk = 1;
continue;
}
for (j = 0;j<7; j++)
{
found5[j] = *(email+pointer+j);
}
if (strcmp(found5, user5) == 0){
printf("Authorized User Found\n");
chk = 1;
continue;
}
pointer++;
}
printf("Check is %d, Pointer is %d\n",chk, pointer);
return 0;
}
#包括
int main()
{
int max_size=100;
char email[100]=“aheanstring4strinstringzil.com”;
int指针=0;
int i=1;
int j=0;
int len=0;
int-chk=0;
char found1[7]=“string1”;
char found2[7]=“string2”;
char found3[7]=“string3”;
char found4[7]=“string4”;
char found5[7]=“string5”;
char user1[7]=“string1”//23
char user2[7]=“string2”//19
char user3[7]=“string3”;//14
char user4[7]=“string4”;//16
char user5[7]=“string5”;//15
while(指针!=max_size&&chk!=1)
{
对于(j=0;j
此处found1
在C中不是有效字符串,因为没有nul终止符。您需要
char found1[8] = "string1";
您将found1
传递给strcmp()
,这将导致未定义的行为,因为strcmp()
需要以null结尾的字符串
或者正如巴拉克·马诺斯所建议的那样
char found1[] = "string1";
将[7]
更改为[]
。检查编译器警告(如果没有看到任何编译器警告,请检查编译器警告设置)。警告:函数“strcmp”的隐式声明
:未包含字符串.h
。即“它工作正常”这只是运气——它可能对其他功能不起作用。非常感谢。它起作用了。@Mohamed,如果我回答了你的问号,答案是一样的
char found1[] = "string1";