Question

希望输入 - ＆gt;

"Enter a word: program"
"Enter a postion to know where to start cutting: 2"
"Enter the following quantity to end up: 4"

希望输出 - ＆gt;

ogra

这是我的代码，但我不知道如何将值插入到不同的数组

#include <stdio.h>
#include <string.h>
int main (){

    char word[100], cutword[50];
    int on, off, i, j;

    printf("Entra a word: ");
    gets(word);
    printf("Enter a postion to know where to start cutting: ");
    scanf("%d", &on);
    printf("Enter the following quantity to end up: ");
    scanf("%d", &off);

    for (i = 0; i<strlen(word); i++){
        if (i >= on && i <= off) ¿cutword[]? = word[i];
    }

    for (j = 0; j<strlen(cutword); j++){
        printf("%c", cutword[j]);
    }

}

Answer 1

int k = 0;
int l = on + off;
for (i = on; i < l; i++){
    cutword[k++] = word[i];
}

for (j = 0; j < k; j++){
    printf("%c", cutword[j]);
}

在这些循环之前添加一些额外的if来验证输入并检查数组边界。

Answer 2

// if there is enough room in the buffers
if( strlen(word) > off) {
   // copy from    word + (offset) 
   //      to  cutword[0] 
   //      off number of characters
   memcpy(cutword, word + on, off ); 
}

多数民众赞成，如果你想从位置2获得4个字符

你的代码获得第2位到第4位。

Answer 3

问题在于您的第一个for循环。仅在off + on之后对其进行迭代，并将¿cutword[]? = word[i];部分替换为cutword[j++] = word[i]; 试试这个

for (j = 0; i = 0; i < off + on; i++){
    if (i >= on && i <= off)
        cutword[j++] = word[i];
}
cutword[j] = '\0';
puts(cutword);

在C中将值插入数组

3 个答案: