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/*PARENTHESIZED EXPRESSION USING STACK */ #include<stdio.h> #include<conio.h> #define MAX 10 int top=-1; int stack[MAX]; void push(char); char pop(); void main() {    char exp[MAX],ch;    int i,flag=1;    clrscr();    printf("\n Enter Infix Expression:-\n");    gets(exp);    i=0;    while(exp[i]!='\0')    {      if(exp[i]=='('||exp[i]=='{'||exp[i]=='[')      { push(exp[i]);      }      if(exp[i]==')'||exp[i]=='}'||exp[i]==']')      {        ch=pop();        if(exp[i]==')'&&(ch=='{'||ch=='['))        { flag=0;        }        if(exp[i]=='}'&&(ch=='('||ch=='['))        { flag=0;        }        if(exp[i]==']'&...

#include<stdio.h> #include<conio.h> #include<string.h> #define max 30 void push(char ch); char pop(); char stack[max]; int top=-1; void main() { char a[20],b[20],k[40],ch; int i,l1,l2; clrscr(); printf("\n Enter First String:-\n"); scanf("%s",a); printf("\n Enter Second String:-\n"); scanf("%s",b); l1=strlen(a); l2=strlen(b); for(i=0;i<l2;i++) {  push(b[i]); //push second string into stack } push(' '); for(i=0;i<l1;i++) {  push(a[i]); //push first string into stack } printf("\n After concatenation of two string:-\n"); i=0; while(top!=-1) {  ch=pop();  if(ch==' ') { k[i]='\0'; printf("%s",strrev(k)); i=0;  } else  {   k[i]=ch;   i++;  } } k[i]='\0'; printf("%s",strrev(k)); getch(); } void push(char ch) { ...