c - 如何读取两个空格之间的数字？

Question

我有一个问题。假设我有

char a[50]={" 99 98 100 97 101 "};

我想要另一个字符串数组，它给我这样的值:

char b[50]={"bcdae"};

那该怎么办？

(a 的 ASCII 值 = 97 等)

Answer 1

#include <stdio.h>

int main() { 
    char a[50]={" 99 98 100 97 101 "};
    char b[50]={0};
    char *p = b; // p now points to b
    int i, num, pos = 0;

    // %d returns each number
    // %n returns the number of bytes consumed up to that point

    while(sscanf(a + pos, "%d%n", &num, &i)==1)
    {
        *p++ = (char)num; // b[0]..b[n] are set to num which is cast into a char
        pos += i; // increment the position by bytes read
    }
    printf("%s\n", b);//cbdae
    return 0;
}