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https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
25 lines
441 B
C++
25 lines
441 B
C++
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#include<stdio.h>
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#include<string.h>
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int main()
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{
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double s,n,m;
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int i,l;
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char h,c[200];
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while(scanf("%c %s",&h,c)==2)
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{
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getchar();
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l=strlen(c);
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if(h<='Z')
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h=h+32;
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for(i=0,n=0;i<l;i++)
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{
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if(c[i]<='Z')
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c[i]+=32;
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if(c[i]==h)
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n++;
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}
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s=n/l;
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printf("%.5lf\n",s);
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}
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}
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