[algogeeks] plz explain output

[ankush]

#include<stdio.h>
void main()
{
        int 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("%d\n",x);
                }
                printf("%f\n",x);
        }
                x=9;
                printf("%f\n",x);
}

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