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Infix to Postfix
58 lines (58 loc) · 1.09 KB
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Infix to Postfix
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#include<stdio.h>
#include<conio.h>
#include<string.h>
void main()
{
char ch,stack[50],infix[50];
int i,j,top=0;
stack[0]='(';
printf("\n infix to postfix exp");
printf("\n enter the infix exp :");
gets(infix);
fflush(stdin);
j=strlen(infix);
printf("\n the postfix exp in:");
for(i=0;i<j;i++)
{
ch=infix[i];
if(((ch>='0')&&(ch<='9'))||((ch>='a')&&(ch<='z'))||((ch>='A')&&(ch<='Z')))
printf("%c",ch);
if(ch=='^')
{
while(stack[top]=='^')
printf("%c",stack[top--]);
stack[++top]=ch;
}
if((ch=='*')||(ch=='/'))
{
while((stack[top]=='*')||(stack[top]=='/')||(stack[top]=='^'))
printf("%c",stack[top--]);
stack[++top]=ch;
}
if((ch=='+')||(ch=='-'))
{
while((stack[top]=='^')||(stack[top]=='*')||(stack[top]=='/')||(stack[top]=='+')||(stack[top]=='-'))
{
printf("\n %c",stack[top--]);
}
stack[++top]=ch;
}
if(ch=='(')
{
stack[++top]=ch;
}
if(ch==')')
{
while(stack[top]!='(')
{
printf("%c",stack[top--]);
fflush(stdin);
}
top--;
}
}
while(stack[top]!='(')
printf("%c",stack[top--]);
fflush(stdin);
getch();
}