好的。又去了一次。
Havent 经常使用字符串。该程序在数组中有字符串和数字，并在 FOR 循环中打印。我还尝试让用户可以使用数组中的单个元素，以便他可以更改值。
我想我的风格很糟糕。但是......这是我得到的。
现在关于GETS（str1），从用户那里获取一个字符串。在程序中第一次使用时，它表现正常。但是在程序中第二次我不得不使用GETS（“%s”，str1）所以它表现得很好。还有一个问题是从用户确定的数组中添加特定数字。显示在 for 循环中...
另一个问题是在 JUMP 之后清除控制台屏幕。所以文字不会淹没屏幕。
评论：我同意 David C. Rankin 的观点，即验证用户数据很重要。仅允许字符串请求中的字符输入和整数请求中的数字。如果像斜线或点这样的“特殊字符”，也会返回错误输入。我试着阅读原始的 K&R C 书，他们谈到了它，主题比如将所有字母变成小写字母或大写字母。但我在运行示例代码时遇到了麻烦，可能是 C89 C11 编译器问题，我不知道。
#include <stdio.h>
//#include <string.h> // GCC32-C . mingw . compile
#define lenght 20 // Orbit_L75.Apartment_9
int main(){
int i,j,k,select,select2,*ptr;
char str1 [lenght];
char str2 [lenght];
char *wordarray [2]={str1,str2}; // character array must have a * asterix pointer .
int numarray [2];
printf ("Type your forname : ");
gets (str1); // gets (wordarray[0]) // alternative syntax
printf ("Type your last name : ");
gets (str2);
printf ("Enter your telephone number : ");
scanf ("%d",&numarray[0]); // assign a value to numarray slot 0
//scanf ("%d",(numarray+0)); // alternative syntax
printf ("Enter your age : ");
scanf ("%d",&numarray[1]); // assign a value to numarray slot 1
printf ("\n\n");
jump1 :
printf ("=========================\n");
for (i=1;i<5;i++)
{printf ("%d\t",i);}
printf ("\n");
for (j=0;j<2;j++)
{printf ("%s\t",wordarray[j]);}
//printf ("%s\t",*(wordarray+j));} // alternative syntax
printf ("\n");
for (k=0;k<2;k++)
{printf ("%d\t",numarray[k]);}
printf ("Sum = %d\n",(numarray[0]+numarray[1])); // add numarray slot 0 and slot 1.
//printf ("Sum = %d",*(numarray+0)+*(numarray+1)); // alternative syntax
printf ("=========================\n");
printf ("\n\nSelect\n1: Change Telephone \n2: Change Age \n3: Change First Name \n4: Change Last Name \n5: RAM location\n");
scanf ("%d",&select);
if (select == 1)
{printf ("New number : ");
scanf ("%d",&numarray[0]);
//scanf ("%d",(numarray+0)); // alternative syntax
printf ("\n");}
else if (select == 2)
{printf ("New age : ");
scanf ("%d",&numarray[1]);
printf ("\n");}
else if (select == 3)
{printf ("New First Name : ");
scanf ("%s",str1); //problems with the display using GETS on the second run.
printf ("\n");}
else if (select == 4)
{printf ("New Last Name : ");
scanf ("%s",str2);
printf ("\n");}
else if (select == 5)
{ // select2
{printf ("\nRAM location of : \n\t1. Telephone number\n\t2. Age\n\t3. First Name.\n\t4. Last Name\n");}
scanf ("%d",&select2);
if (select2 == 1)
{ptr = &numarray[0];
printf ("\nTelephone number\nValue in Decimal\t: %d\nValue in Hexadecimal\t: %ph\nRAM location in decimal\t: %d\nRAM location in Hex\t: %ph\n\n\n",*ptr,*ptr,ptr,ptr);}
else if (select2 == 2)
{ptr = &numarray[1];
printf ("\nAge\nValue in Decimal\t: %d\nValue in Hexadecimal\t: %ph\nRAM location in decimal\t: %d\nRAM location in Hex\t: %ph\n\n\n",*ptr,*ptr,ptr,ptr);}
else if (select2 == 3)
{ptr = &wordarray[0];
printf ("\nFirst Name\nValue in Text\t: %s\nValue in Hexadecimal\t: %ph\nRAM location in decimal\t: %d\nRAM location in Hex\t: %ph\n\n\n",*ptr,*ptr,ptr,ptr);}
else if (select2 == 4)
{ptr = &wordarray[1];
printf ("\nLast Name\nValue in Text\t: %s\nValue in Hexadecimal\t: %ph\nRAM location in decimal\t: %d\nRAM location in Hex\t: %ph\n\n\n",*ptr,*ptr,ptr,ptr);}
else if (select2 <1 || select2 > 4)
{printf ("\nValue is out of range, Try again .\n\n");}
} // end IF select2
else if (select <1 || select > 5)
{printf ("\nValue is out of range, Try again .\n\n");}
goto jump1;
return 0;
} // end MAIN