设计一个给定文法和对应的FIRSTVT和LASTVT集，能依据依据文法和FIRSTVT和LASTVT生成算符优先分析表

if(text[i][j+2]!='\\0'&&zhongjie(text[i][j])&&zhongjie(text[i][j+2])&&!zhongjie(text[i][j+1])) {

m=xiabiao(text[i][j]); n=xiabiao(text[i][j+2]); data[m][n]='='; }

if(zhongjie(text[i][j])&&!zhongjie(text[i][j+1])) {

for(k=0;k

if(st[k][0]==text[i][j+1]) break; }

m=xiabiao(text[i][j]); for(t=0;t

n=xiabiao(first[k][t+1]); data[m][n]='<'; } }

if(!zhongjie(text[i][j])&&zhongjie(text[i][j+1])) {

for(k=0;k

if(st[k][0]==text[i][j]) break; }

n=xiabiao(text[i][j+1]); for(t=0;t

m=xiabiao(last[k][t+1]); data[m][n]='>'; } } } }

m=xiabiao('#');

for(t=0;t

n=xiabiao(first[0][t+1]); data[m][n]='<'; }

n=xiabiao('#');

for(t=0;t

m=xiabiao(last[0][t+1]); data[m][n]='>'; }

data[n][n]='='; }

void firstvt(char c) //求FIRSTVT集 {

int i,j,k,m,n; for(i=0;i

if(st[i][0]==c) break; }

if(fflag[i]==0) {

n=first[i][0]+1; m=0; do {

if(m==2||st[i][m]=='|') {

if(zhongjie(st[i][m+1])) {

first[i][n]=st[i][m+1]; n++; } else {

if(zhongjie(st[i][m+2])) {

first[i][n]=st[i][m+2]; n++; }

if(st[i][m+1]!=c) {

firstvt(st[i][m+1]); for(j=0;j

if(st[j][0]==st[i][m+1]) break; }

for(k=0;k

int t;

for(t=0;t

if(first[i][t]==first[j][k+1]) break; }

if(t==n) {

first[i][n]=first[j][k+1]; n++; } } } } } m++;

}while(st[i][m]!='\\0'); first[i][n]='\\0'; first[i][0]=--n; fflag[i]=1; } }

void lastvt(char c) //求LASTVT集 {

int i,j,k,m,n; for(i=0;i

if(st[i][0]==c) break; }

if(lflag[i]==0) {

n=last[i][0]+1; m=0; do {

if(st[i][m+1]=='\\0'||st[i][m+1]=='|') {

if(zhongjie(st[i][m])) {

}

}

last[i][n]=st[i][m]; n++; } else {

if(zhongjie(st[i][m-1])) {

last[i][n]=st[i][m-1]; n++; }

if(st[i][m]!=c) {

lastvt(st[i][m]); for(j=0;j

if(st[j][0]==st[i][m]) break; }

for(k=0;k

int t;

for(t=0;t

if(last[i][t]==last[j][k+1]) break; }

if(t==n) {

last[i][n]=last[j][k+1]; n++; } } } } } m++;

}while(st[i][m]!='\\0'); last[i][n]='\\0'; last[i][0]=--n; lflag[i]=1;