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void main(){
    int t;
    int aa[]={9,8,7,644,3,2,1,2,33};
    int n= sizeof(aa)/ sizeof(int );
    for (int i = 0; i <n-1; ++i) {
        int k=i;
        for (int j = i+1; j <n; ++j) {
            if(aa[j]<aa[k]){
                k=j;//标记比a[i]小的元素下标，下一步进行交换
            }
        }
        t=aa[k];
        aa[k]=aa[i];
        aa[i]=t;
    }
    for (int i = 0; i <n; ++i) {
        printf("%d ",aa[i]);
    }
}

void main(){//将字符串str的内容颠倒存放
    char str[]={"abcdefg"};
    char *p1,*p2,ch;
    p1=str;
    p2=str;
    while (*p2!='\0')
    p2++;
    p2--;
    while (p1<p2){
        ch=*p1;
        *p1=*p2;
        *p2=ch;
        p1++;
        p2--;
    }
    puts(str);
}