Exercicio rev 2

#include <stdio.h>
#include <stdlib.h>
int n,m;
int temp[30][30];
void ler(){
	int i,j;
	printf("Numero de cidades\n");
	scanf("%d",&n);
	printf("Numerdo de dias\n");
	scanf("%d",&m);
	printf("Agora as temperaturas\n");
	for(i=0;i<n;i++){
		for(j=0;j<m;j++){
			scanf("%d",&temp[i][j]);
		}
	}
}
void media(){
	int i,j;
	float med[30],md=0;
	int s=0;
	for (i=0;i<n;i++){
		for (j=0;j<m;j++){
			s=s+temp[i][j];
		}
		md=(s*1.0)/m;
		med[i]=md;
		md=0;
		s=0;
	}
	for (i=0;i<n;i++){
		printf("%.2f\n",med[i]);

	}
}
void maior(){
	int i,j;
	int maior=0;
	for (i=0;i<n;i++){
		for(j=0;j<m;j++){
			if(temp[i][j]>maior)
				maior=temp[i][j];
		}
	}
	for (i=0;i<n;i++){
		for(j=0;j<m;j++){
			if(temp[i][j]==maior)
				printf("Temperatura do dia %d da capital %d\n", j+1, i+1);
		}
	}
}
void isol(){
	int i,j;
	for(i=1;i<n-1;i++){
		for(j=1;j<m-1;j++){
			if(temp[i][j]>temp[i-1][j] && temp[i][j]>temp[i][j-1] && temp[i][j]> temp[i+1][j] && temp[i][j]> temp[i][j+1] ){
				printf("%d\n",temp[i][j]);
				printf("%d %d\n",i+1,j+1);
		}
	}
}
}
void fora(){
	int td,c,i,j;
	printf("Capital que deseja verificar\n");
	scanf("%d",&c);
	printf("Temperatura dada\n");
	scanf("%d",&td);
	for (i=0;i<n;i++){
		for (j=0;j<m;j++){
			if(i+1==c){
				if(temp[i][j]>=td && (temp[i][j])-5<=td || temp[i][j]<=td && (temp[i][j])+5>=td){
					printf("%d\n",temp[i][j]);
				}
			}
		}
	}
}

int main() {

	int op;
	do{
		printf("1- Ler dados\n");
		printf("2- media\n");
		printf("3- maior\n");
		printf("4- isolados\n");
		printf("5- fora\n");
		printf("6- sair\n");
		scanf("%d",&op);
		switch (op)
		{
			case 1: ler();
					break;
			case 2: media();
					break;
			case 3: maior();
					break;
			case 4: isol();
					break;
			case 5: fora();
					break;
		}

	}while (op!=6);


	return 0;
}