mat =as.data.frame(diag(9))
for( i in 1:9){
for(j in 1:9)
if(i>=j)
{mat[i,j]=paste(i,'x',j,'=',i*j)
}
else {mat[i,j]=''}
}
mat
运行上述就可以得出#include<stdio.h>void main()
{
char c1[100],c2[100]
int i
scanf("%s",c1)
scanf("%s",c2)
for(i=0i<100i++)
{
if(c1[i]>c2[i]){printf("%s>%s",c1,c2)break}
if(c1[i]<c2[i]){printf("%s<%s",c1,c2)break}
if(i==99)printf("%s=%s",c1,c2)
}
printf("\n")
}