#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string.h>
int main()
{
    int i,m=0,n=0;
    char c1, c2;
    char str1[80], str2[20];
    printf("Input str1:\n");
    gets_s(str1);
    printf("The str1 is:\n");
    for (i = 0; (c1 = str1[i]) != '\0'; i++)
    {
        m++;
        printf("%c", str1[i]);    
    }
    printf("\n");
    printf("m=%d\n", m);
    printf("Input str2:\n");
    gets_s(str2);
    printf("The str2 is:\n");
    for (i = 0; (c2 = str2[i]) != '\0'; i++)
    {
        n++;
        printf("%c", str2[i]);    
    }
    printf("\n");
    printf("n=%d\n",n);
    if (n <= 80 - (m + 1))
    {
        printf("Now we connect str1 and str2:\n");
        for (i = 0; i < m + n; i++)
        {
            c1 = str1[i];
            c2 = str2[i];
            str1[m + i] = c2;
            printf("%c", str1[i]);
        }
    }
    else
        printf("There is an error in your input,please try again!");
    printf("\n");
    return 0;
}

最后面这个
for (i = 0; i < m + n; i++)
        {
            c1 = str1[i];
            c2 = str2[i];
            str1[m + i] = c2;
            printf("%c", str1[i]);
        }
str2[i]明显超了，为什么输出是对的

[此贴子已经被作者于2016-12-28 10:02编辑过]

弄错了不好意思，其实我是想表达这个
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string.h>
int main()
{
    int i,m=0,n=0;
    char c1, c2;
    char str1[10], str2[5];
    printf("Input str1:\n");
    gets_s(str1);
    printf("The str1 is:\n");
    for (i = 0; (c1 = str1[i]) != '\0'; i++)
    {
        m++;
        printf("%c", str1[i]);   
    }
    printf("\n");
    printf("m=%d\n", m);
    printf("Input str2:\n");
    gets_s(str2);
    printf("The str2 is:\n");
    for (i = 0; (c2 = str2[i]) != '\0'; i++)
    {
        n++;
        printf("%c", str2[i]);   
    }
    printf("\n");
    printf("n=%d\n",n);
    if (n <= 10 - (m + 1))
    {
        printf("Now we connect str1 and str2:\n");
        for (i = 0; i < m + n; i++)
        {
            c1 = str1[i];
            c2 = str2[i];
            str1[m + i] = c2;
            printf("%c", str1[i]);
        }
    }
    else
        printf("There is an error in your input,please try again!");
    printf("\n");
    return 0;
}
最后这个
for (i = 0; i < m + n; i++)
{
c1 = str1[i];
c2 = str2[i];}
str2[i]中的i明显超了，因为定义str2[5],为什么输出会是对的

会了

大粪能吃？头一次听说

真新鲜