初学C语言(2)-四则运算计算器

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#include <stdio.h>
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int main(){
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  float num1,num2,result;
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  char yunshuang;
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  while(true){
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    printf("输入数字，例如39+21\n");
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    scanf("%f%c%f",&num1,&yunshuang,&num2);
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    if(yunshuang == '+'){
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      result =  num1 + num2;
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    }
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    else if(yunshuang == '-'){
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      result = num1 - num2;
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    }
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    else if(yunshuang == '*'){
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      result = num1 * num2;
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    }
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    else if(yunshuang == '/'){
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      result = (double)num1 / (double)num2;
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    }
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    printf("= %f\n---------------------------\n",result);
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  }
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}