corrected.c

#include<stdio.h>
#include<stdlib.h>
//STRUCTURE GLOBAL DEF

	typedef struct{
		char name[20];
		long int pop;
		float lit;
	} city;
int count;
//END OF STRUCTURE DEF

//FUNCTION FOR SORTING IN POPULATION
void sortstructpop(city *sample){
	int i,j;
	long int temp;
	for(i=1;i<count;i++){
		for(j=0;j<count-i;j++){
			if(sample[j].pop<sample[j+1].pop){
				temp = sample[j].pop;
				sample[j].pop = sample[j+1].pop;
				sample[j+1].pop=temp;
			}
		}
	}	
}

//FUNCTION FOR SORTING IN LITERACY RATE

void sortstructlit(city *sample){
	int i,j;
	float temp;
	for(i=1;i<count;i++){
		for(j=0;j<count-i;j++){
			if(sample[j].lit<sample[j+1].lit){
				temp = sample[j].lit;
				sample[j].lit = sample[j+1].lit;
				sample[j+1].lit=temp;
			}
		}
	}	
}
//DISPLAY CITY FUNCTION

void displaycity(city *sample){
	int i;
	for(i=0;i<count;i++){
		printf("\n******\n");
		printf("City Name: %s\n",sample[i].name);
		printf("Population: %ld\n",sample[i].pop);
		printf("Literacy Rate: %.2f %% \n",sample[i].lit);
	}	
}
//MAIN FUNCTION STARTS FROM HERE
main()
{
	int i;
	printf("Total Number of Cities: ");scanf("%d",&count);
	city *arr;
	arr = (city *) malloc(sizeof(city)*count);
	for(i=0;i<count;i++){
		printf("------NEW CITY------\n");
		printf("Name of the City: ");scanf("%s",&arr[i].name);
		printf("Population: ");scanf("%ld",&arr[i].pop);
		printf("Literacy rate: ");scanf("%f",&arr[i].lit);	
	}
	printf("\n\nCITY DATA ENTRY COMPLETE!\nSELECTION MENU:\n ");
	printf("*********************\n");
	printf("1. Display According to Literacy Rate.\n2. Display According to Population.\n3.Details of a City.\n");
	int choice;scanf("%d",&choice);
	switch(choice){
	case 1: sortstructlit(&arr[0]);
		printf("Displaying According to Literacy Rate: \n");
		displaycity(&arr[0]);
		break;
	case 2: sortstructpop(&arr[0]);
		printf("Displaying According to population: \n");
		displaycity(&arr[0]);
		break;
	case 3: displaycity(&arr[0]);
		break;
	}

/*	for(i=0;i<count;i++){
		printf("------NEW CITY------\n");
		printf("City Name: %s\n",arr[i].name);
	}*/
	


}