Question

c语言如何实现“第一行输出1个1，第二行输出2个2.。。。。。。。”

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Answer 1

#include <stdio.h>

main(){
int i,j;

for(i=1; i<=5; i++){
for(j=1; j<=i; j++)
printf("%d",i);
printf("\n");
}
}

Answer 2

#include <stdio.h>
#define MAX 5 /*输出行数*/
int main(void)
{
int i,j;
for (j=i=1;i<=MAX;j=++i)
{
while(j-->0) printf("%d",i);
putchar('\n');
}
return 0;
}

Answer 3

#include <iostream.h>

int main()
{
int a,b;
for (a=1;a<=5;a++)
{
for (b=1;b<=a;b++)
{
cout<<a;

}
cout<<"\n";
}
return 0;
}