明解C语言 入门篇 第十章答案

练习10-1

#include <stdio.h>

void adjust_point(int*n) {
    if (*n > )
        *n = ;
    if (*n < )
        *n = 0;
}

int main() {
    int x;
    printf("请输入一个数：");
    scanf("%d", &x);
    adjust_point(&x);
    printf("修改后的值是%d",x);
}

练习10-2

void decrement_date(int* y, int* m, int* d) {
    *d -= ;

    if (*d == ) {
        *m -= ;

        if (*m ==  || *m ==  || *m ==  || *m ==  || *m ==  || *m ==  ||* m == ) {
            *d = ;

        }
        if (*m == ) {
            *d = ;
            if (*y %  == ) {
                *d = ;
            }
        }

        else
            *d = ;
        if (*m == ) {
            *m = ;
            *y -= ;
        }

    }

}

void increment_date(int* y, int* m, int* d) {

    *d += ;
    if ((*m ==  || *m ==  || *m ==  || *m ==  || *m ==  || *m ==  || *m == ) && (*d == )) {
        *d = ;
        *m += ;
    }
    if ((*m ==  || *m ==   || *m ==  || *m ==  ) && (*d == )) {
        *d = ;
        *m += ;
    }
    if (*m == ) {

        if (*d == && ((*y & ) != )) {
            *d = ;
            *m += ;
        }

        if (*d ==  && ((*y & ) == )) {
            *d = ;
            *m += ;

        }
    }
    if (*m == ) {
        *y += ;
        *m = ;
    }
}

练习10-3

#include<stdio.h>

void swap(int* px, int*py) {
    int temp = *px;
    *px = *py;
    *py = temp;
}

void  sort3(int*n1, int*n2, int*n3) {
    if (*n1 > *n2) {
        swap(n1, n2);
    }
    if (*n1 > * n3) {
        swap(n1, n3);
    }
    if (*n2 > * n3) {
        swap(n2, n3);
    }
}

int main(void) {
    int n1, n2, n3;
    printf("n1=");
    scanf("%d", &n1);
    printf("n2=");
    scanf("%d", &n2);
    printf("n3=");
    scanf("%d", &n3);
    putchar('\n');
    sort3(&n1, &n2, &n3);
    printf("%d,%d,%d", n1, n2, n3);
}

练习10-4

#include <stdio.h>
#define number 5
void set_idx(int*v, int n) {
    int i = ;
    for (i = ; i < n; i++) {
        *(v + i) = i;
    }
}

int main() {
    int i;
    int x[number];
    set_idx(x, number);
    for (i = ; i < number; i++) {
        printf("x[%d]=%d", i,x[i] );
            putchar('\n');
    }

}

练习10-5

会报错

数组中元素会溢出，因为直接从v【2】开始赋值。