Вот задания все. Прикрепляю файлами. Но на всякий случай, еще код сюда:

1)

#include "stdio.h"

#include "stdlib.h"

using namespace std;

int main(){

char a[256];

int amount = 0;

printf("Enter text: "); scanf("%s", &a);

for(int i = 0 ; i < sizeof(a)/sizeof(*a); i += 1){

 if(a[i] == 'a') amount ++;

}

printf("result: %dn", amount);

system("pause");

return 0;

}

2)

#include "stdio.h"

#include "stdlib.h"

using namespace std;

struct SchoolChild{

char gender;

char last_name[20];

char first_name[20];

int weight;

int height;

};

int main(){

int N; //amount of pupils

int amount_girls = 0, amount_boys = 0;

int average_height_girls = 0;

int average_weight_boys = 0;

int max_height_boys = 0;

printf("Enter amount of pupils: "); scanf("%d",&N); fflush(stdin);

SchoolChild A[N];

for(int i = 0; i < N; i++){

 printf("Informantion about %dn", i+1);

 printf("Gender: "); scanf("%c",&A[i].gender); _flushall();

 printf("Last_name: "); scanf("%s",&A[i].last_name); _flushall();

 printf("First_name: "); scanf("%s",&A[i].first_name); fflush(stdin);

 printf("Weight(kg)): "); scanf("%d",&A[i].weight); fflush(stdin);

 printf("Height(cm)): "); scanf("%d",&A[i].height); fflush(stdin);

 printf("__________________________________________________n");

}

fflush(stdin);

for(int i = 0; i < N; i++){

 if(A[i].gender == 'М' or A[i].gender == 'M'){

  amount_boys +=1;

  if(A[i].height > max_height_boys){

   max_height_boys = A[i].height;

  }

  average_weight_boys += A[i].weight;

 }else if(A[i].gender == 'F' or A[i].gender == 'Ж'){

  amount_girls +=1;

  average_height_girls += A[i].height;

 }

}

if(amount_boys > 0)

    average_weight_boys = average_weight_boys / amount_boys;

if(amount_girls > 0)

    average_height_girls = average_height_girls / amount_girls;

printf("Average weight of boys is %dn", average_weight_boys );

printf("Average height of girls is %dn", average_height_girls );

printf("Max height of boys is %dn", max_height_boys);

system("pause");

return 0;

}

3)

#include "stdio.h"

#include "stdlib.h"

#include "fstream"

using namespace std;

int main(){

const int amount_numbers = 10;

char buffer[4];

float mas[amount_numbers];

float temp_number;

ofstream fout("cppstudio.txt", ios_base::out | ios_base::trunc);  

for(int i = 0; i < amount_numbers; i++){

 printf("Enter number(%d)): ", i + 1); scanf("%f",&temp_number);

    fout << temp_number << "n";

}

fout.close();

ifstream fin("cppstudio.txt", ios_base::in);

for (int i = 0; i < amount_numbers; i++){

 fin >> buffer;

 float ibuffer = atof(buffer);

 mas[i] = ibuffer;

}

fin.close();

float min = mas[0];

float max = mas[0];

for (int i = 1; i < amount_numbers; i++){

 if(mas[i] > max){

  max = mas[i];

 }

 if(mas[i] < min){

  min = mas[i];

 }

}

printf("Max number is %fn", max);

printf("Min number is %fn", min);

system("pause");

return 0;

}