C语言四舍五入保留一位小数

要在C语言中实现四舍五入并保留一位小数，可以使用以下代码：

#include <stdio.h>

int main() {
    double num;
    scanf("%lf", &num);
    num = (int)(num * 10 + 0.5) / 10.0;
    printf("%.1lf\n", num);
    return 0;
}

这段代码首先使用`scanf`函数来获取用户输入的浮点数。然后将这个浮点数乘以10，并加上0.5来实现四舍五入的效果。接着，将结果转换为整数类型，再除以10.0来保留一位小数。最后，使用`printf`函数来输出结果，使用"%.1lf"格式来保留一位小数。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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