软件测试阶段白盒测试，以如下程序为例，画出其程序流程图，并给出至少四种逻辑覆盖标准的测试用例。C语言代码

好的，以下是C语言代码：

#include <stdio.h>

int main() {
   int num1, num2, sum;
   printf("Enter two numbers: ");
   scanf("%d %d", &num1, &num2);
   sum = num1 + num2;
   if(sum > 50) {
      printf("Sum is greater than 50\n");
   } else {
      printf("Sum is less than or equal to 50\n");
   }
   return 0;
}

以下是程序流程图：

1. 开始
2. 输入num1和num2两个整数
3. 计算它们的和sum
4. 如果sum大于50，则执行步骤5，否则执行步骤6
5. 输出“Sum is greater than 50”
6. 输出“Sum is less than or equal to 50”
7. 结束

以下是四种逻辑覆盖标准的测试用例：

1. 有效等价类测试用例：
- 输入num1=20，num2=30，期望输出“Sum is greater than 50”
- 输入num1=10，num2=20，期望输出“Sum is less than or equal to 50”
- 输入num1=0，num2=50，期望输出“Sum is greater than 50”
- 输入num1=50，num2=0，期望输出“Sum is greater than 50”

2. 边界值测试用例：
- 输入num1=25，num2=25，期望输出“Sum is greater than 50”
- 输入num1=0，num2=50，期望输出“Sum is greater than 50”
- 输入num1=50，num2=0，期望输出“Sum is greater than 50”
- 输入num1=25，num2=24，期望输出“Sum is less than or equal to 50”

3. 条件测试用例：
- 输入num1=20，num2=30，期望输出“Sum is greater than 50”
- 输入num1=30，num2=20，期望输出“Sum is greater than 50”
- 输入num1=25，num2=25，期望输出“Sum is greater than 50”
- 输入num1=5，num2=5，期望输出“Sum is less than or equal to 50”

4. 路径测试用例：
- 输入num1=20，num2=30，期望输出“Sum is greater than 50”
- 输入num1=10，num2=40，期望输出“Sum is greater than 50”
- 输入num1=30，num2=20，期望输出“Sum is greater than 50”
- 输入num1=40，num2=10，期望输出“Sum is greater than 50”
- 输入num1=25，num2=25，期望输出“Sum is greater than 50”
- 输入num1=5，num2=45，期望输出“Sum is greater than 50”
- 输入num1=45，num2=5，期望输出“Sum is greater than 50”
- 输入num1=5，num2=5，期望输出“Sum is less than or equal to 50”