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Petya loves lucky numbers. Everybody knows that lucky numbers are positive integers whose decimal representation contains only the lucky digits 4 and 7. For example, numbers 47, 744, 4 are lucky and 5, 17, 467 are not. Petya has a number consisting of n digits without leading zeroes. He represented …
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#include<stdio.h> #define SIZE 10 struct stack{ int a[SIZE]; int top; }; struct stack s; s .top=-1; void push(int value); void pop(); void display(); void peakelement(); int main() { int choice,value; while(1) { printf("\n1.push 2. pop 3.display 4. peakelement 5. exit"); printf("enter your choice"); scanf("%d",&choice); if(choice==1) { printf("enter value to be … 
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