ms21.c

#include<stdio.h>
void main()
{
    float x;
    float t;
    scanf("%f",&t);
    printf("%f\n",t);
    x=90;
    printf("%f\n",x);
    {
        x=1;
        printf("%f\n",x);
        {
            x=30;
            printf("%f\n",x);
        }
        printf("%f\n",x);
    }
        x==9;
        printf("%f\n",x);
}