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Is floating point math broken?（33答案）
五年前就关门了。
我编码的是

#include <stdio.h>
int main(){

    float a, b;

    printf("enter initial value.");
    fflush(stdout);
    scanf("%f", &a);

    printf("add up the following number.");
    fflush(stdout);
    scanf("%f", &b);

    printf("current value is %f.\n", (a+b));
    fflush(stdout);

    b = a+b;

    printf("enter a value to subtract.");
    fflush(stdout);
    scanf("%f", &a);

    printf("current value is %f. \n", b-a);
    fflush(stdout);

    b = b-a;

    printf("enter a value to multiply.");
    fflush(stdout);
    scanf("%f", &a);


    printf("current value is %f. \n", a*b);
    fflush(stdout);

    b = a*b;

    printf("enter a value to devide.");
    fflush(stdout);
    scanf("%f", &a);


    printf("current value is %f. \n", b/a);
    fflush(stdout);


    return 0;
}

输出量：

enter initial value. 1000000
add up the following number. 9000000
current value is 10000000.000000.
enter a value to subtract. 0
current value is 10000000.000000. 
enter a value to multiply. 1000000
current value is 10000000000000.000000. 
enter a value to devide. 10
current value is 999999982796.800050.

https://i.stack.imgur.com/xuqab.png
我想要10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000应该修什么？