#include<stdio.h>
int main()
{
int i = 0;
int k = 0;
for (i = 1; i <= 9; i++)
{
for (k = 1; k <= i; k++)
{
printf("%d*%d=%d\t", i, k, i * k);
}
printf("\n");
}
return 0;
}
for形式
#include<stdio.h>
int main()
{
int sum = 0;
int i = 1;
int flag = 1;
for(i=1;i<=100;sum=sum+i*flag,i++,flag=-flag)
{
}
printf(" %d\n",sum);
return 0;
}
#include <stdio.h>
int main()
{
int arr[3][3] = {{1,2,3},{4,5,6},{7,8,9}};
int i,j;
int sum=0;
for(i=0;i<3;i++)
{
for(j=0;j<3;j++){
if(i==j||i+j==2)
sum+=arr[i][j];
#include <stdio.h>
int main()
{
char c = 'a';
int n = c; //将c赋值给n
float f = n; //将c赋值给f
double d = f; //将c赋值给d
printf("%d\n",n);
printf("%f\n",f);
printf("%lf\n",d);
return 0;
}
