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#include<stdio.h>
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int main()
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{
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int a,b,d;
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char c;
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printf("输入运算式：");
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scanf("%d%c%d",&a,&c,&b);
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switch(c)
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{
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case'+':d=a+b;break;
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case'-':d=a-b;break;
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case'*':d=a*b;break;
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case'/':d=a/b;break;
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}
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printf("%d%c%d=%d\n",a,c,b,d);
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}
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