C Source file of program
#include<stdio.h>
char str[50],opstr[75];
int f[2][9]={2,3,4,4,4,0,6,6,0,1,1,3,3,5,5,0,5,0};
int col,col1,col2;
char c;
void swt()
{
switch(c) {
case'+':col=0;
break;
case'-':col=1;
break;
case'*':col=2;
break;
case'/':col=3;
break;
case'^':col=4;
break;
case'(':col=5;
break;
case')':col=6;
break;
case'd':col=7;
break;
case'$':col=8;
break;
default:printf("\nTERMINAL MISSMATCH\n");
exit(1);
break;
}
// return 0;
}
main()
{
int i=0,j=0,col1,cn,k=0;
int t1=0,foundg=0;
char temp[20];
clrscr();
printf("\nEnter arithmetic expression:");
scanf("%s",&str);
while(str[i]!='\0') i++; str[i]='$';
str[++i]='\0';
printf("%s\n",str);
come: i=0;
opstr[0]='$';
j=1;
c='$';
swt();
col1=col;
c=str[i];
swt();
col2=col;
if(f[1][col1]>f[2][col2])
{
opstr[j]='>';
j++;
}
else if(f[1][col1]<f[2][col2])
{
opstr[j]='<';
j++;
}
else
{
opstr[j]='=';j++;
}
while(str[i]!='$')
{
c=str[i];
swt();
col1=col;
c=str[++i];
swt();
col2=col;
opstr[j]=str[--i];
j++;
if(f[0][col1]>f[1][col2])
{
opstr[j]='>';
j++;
}
else if(f[0][col1]<f[1][col2])
{
opstr[j]='<';
j++;
}
else
{
opstr[j]='=';
j++;
}
i++;
}
opstr[j]='$';
opstr[++j]='\0';
printf("\nPrecedence Input:%s\n",opstr);
i=0;
j=0;
while(opstr[i]!='\0')
{
foundg=0;
while(foundg!=1)
{
if(opstr[i]=='\0')
goto
redone;
if(opstr[i]=='>')foundg=1;
t1=i;
i++;
}
if(foundg==1)
for(i=t1;i>0;i--)
if(opstr[i]=='<')
break;
if(i==0)
{
printf("\nERROR\n");
exit(1);
}
cn=i;
j=0;
i=t1+1;
while(opstr[i]!='\0')
{
temp[j]=opstr[i];
j++;i++;
}
temp[j]='\0';
opstr[cn]='E';
opstr[++cn]='\0';
strcat(opstr,temp);
printf("\n%s",opstr);
i=1;
}
redone:k=0;
while(opstr[k]!='\0')
{
k++;
if(opstr[k]=='<')
{
printf("\nError");
exit(1);
}
}
if((opstr[0]=='$')&&(opstr[2]=='$'))
goto sue;
i=1;
while(opstr[i]!='\0')
{
c=opstr[i];
if(c=='+'||c=='*'||c=='/'||c=='$')
{
temp[j]=c;
j++;
}
i++;
}
temp[j]='\0';
strcpy(str,temp);
goto come;
sue:
printf("\n success");
return 0;
}
Output :
