Practice C language often

        Practice it from time to time to prevent your programming from being rusty.

Table of contents

1. Calculate the sum of odd numbers in a number

2. Simulate signal transmission, send string A, receive string B, and judge whether the two signals are consistent. If they are inconsistent, output the wrong character

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1. Calculate the sum of odd numbers in a number

Example:

Input: 123456

Output: 9

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int sum = 0;
    int num = 0;
    printf("请输入一个数字：");
    scanf("%d", &num);
    while (num != 0)
    {
        int sub = num % 10; //得到个位的数字，顺序为个位向万位
        if (sub % 2 == 1)    //奇数
            sum += sub;   //和相加 
        num = num / 10;   //把该位置数字去掉
    }
    printf("奇数和是：%d", sum);

    return 0;
}

2. Simulate signal transmission, send string A, receive string B, and judge whether the two signals are consistent. If they are inconsistent, output the wrong character

Example:

Input: abcd abc

output: d

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
	char a[256] = "";
	char b[256] = "";
	
	scanf("%s %s",a,b);
	
	int ret = strcmp(a,b);

	if(ret == 0)
		printf("两个信号一致\n");
	else if(ret > 0)
	{
		//printf("a > b\n");
		printf("两个信号不一致\n");
		for (int i = 0; i < strlen(a); i++)
		{
			if (a[i] != b[i])
			{
				printf("错误的字符为：%c\n",a[i]);
			}
		}
	}
	else
		printf("数据错误\n");
	
	return 0; 
 }

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