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C/C++ code:
#include<stdio.h>
int main()
{
float a,b,c;
char ch; char d;
printf("a");
scanf("%f",&a);
printf("b");
scanf("%f",&b);
printf("c");
scanf("%c",&c); [color=#FF0000]///////ΪʲôÕâ¾ä²»ÄÜÖ´ÐУ¿[/color]
printf("xxx");


}

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---

#include <stdio.h>
int main()
{
float a=0,b=0,c=0;
char ch=0;    char d=0;
printf("a\n");
scanf("%f",&a);
printf("b\n");
scanf("%f",&b);
printf("c\n");
getchar();
scanf("%c",&ch); ///////ΪʲôÕâ¾ä²»ÄÜÖ´ÐУ¿
printf("xxx\n");
}

---

C/C++ code:
#include<stdio.h>
int main()
{
float a,b,c;
char ch; char d;
printf("a");
scanf("%f",&a);
fflush(stdin);//Çå¿Õ»º³åÇø
printf("b");
scanf("%f",&b);
fflush(stdin);//Çå¿Õ»º³åÇø
printf("c");
scanf("%c",&c);
printf("xxx");


}