6. 用scanf函数输入数据，使a=3,b=7,x=8.5,y=71.82,c1=A, c2=a，并将其依次输出。

以下是代码实现：

#include <stdio.h>

int main() {
    int a, b;
    float x, y;
    char c1, c2;

    scanf("%d %d %f %f %c %c", &a, &b, &x, &y, &c1, &c2);

    printf("a = %d\n", a);
    printf("b = %d\n", b);
    printf("x = %.1f\n", x);
    printf("y = %.2f\n", y);
    printf("c1 = %c\n", c1);
    printf("c2 = %c\n", c2);

    return 0;
}

输出结果如下：

a = 3
b = 7
x = 8.5
y = 71.82
c1 = A
c2 = a