Simple programming of functions in C Language

Simple programming of functions in C Language
1. implement a function to print the multiplication table. specify the number of rows and columns in the table, input 9, output 9*9, OUTPUT 12, and output 12*12.

#include <stdio.h>int chengfa(int n,int i,int j,int k){scanf("%d",&n);    for(i=1;i<=n;i++)      {          for(j=1;j<=i;j++)        {            k=i*j;            printf("%dx%d=%2d  ",j,i,k);        }        printf("\n");    }}int main(){      int a=0,b=0,c=0,d=0;    chengfa(a,b,c,d);    system("pause");    return 0;}

 

2. Use a function to exchange two numbers.

#include<stdio.h>int swap(int *p1,int *p2){int tmp;tmp=*p1;*p1=*p2;*p2=tmp;}int main(){    int a=12;    int b=34;     swap(&a ,&b);    printf("a=%d\nb=%d\n",a,b);    system("pause");    return 0;}

 

3. Implement a function to determine whether year is a yearly renewal.

# Include <stdio. h> int year (int n) {scanf ("% d", & n); if (n % 4 = 0) & (n % 100! = 0) | (n % 400 = 0) printf ("% d is a leap year! ", N); else printf (" % d is not a leap year! ", N) ;}int main () {int a; year (a); system (" pause "); return 0 ;}