#include <stdio.h>
#include <stdlib.h>
#include <string.h>
  
//Exercise 12-4: Write a program that lists all the planes that leave from two
//airports specified by the user.
 
int main(void)
{
   int i;
   char city1[2], city2[2]; // airports specified by the user
 
 struct airline {
   int flight_N; // Flight number
   char origin_airp[];  // Originating airport code (three characters)
   char desti_airp[]; //Destination airport code (three characters)
   int start_time[];  //Starting time
   int arrive_time[];  //Arrival time
   };
 
  struct airline myfli[4];
 
 
    myfli[0].flight_N = 329;
	strcpy(myfli[0].origin_airp,"ABC");
	strcpy(myfli[0].desti_airp,"KID");
	myfli[0].start_time[0] = 05;
	myfli[0].start_time[1] = 30;
	myfli[0].arrive_time[0] = 10;
	myfli[0].arrive_time[1] = 55;
  
	myfli[1].flight_N = 323;
	strcpy(myfli[1].origin_airp,"CCC");
	strcpy(myfli[1].desti_airp,"LLI");
	myfli[1].start_time[0] = 05;
	myfli[1].start_time[1] = 30;
	myfli[1].arrive_time[0] = 9;
	myfli[1].arrive_time[1] = 55;
	
	myfli[2].flight_N = 559;
	strcpy(myfli[2].origin_airp,"BBB");
	strcpy(myfli[2].desti_airp,"AAA");
	myfli[2].start_time[0] = 07;
	myfli[2].start_time[1] = 30;
	myfli[2].arrive_time[0] = 10;
	myfli[2].arrive_time[1] = 55;
    
    strcpy(city1,"ABC");
    strcpy(city2,"CCC");
    
    
    for (i = 0; i < 4; ++i) {
    
    if (strcmp(myfli[i].origin_airp, city1) == 0 || strcmp(myfli[i].origin_airp, city2) == 0 ){
        printf("Plane Numer: %d\n", myfli[i].flight_N); }
    
    }
  
 
return (0);
}

#include <stdio.h>
#include <string.h>


// Exercise 9-5: Write a function that returns the maximum value of an array of
// numbers.


int maximo(int numeros[])
{

int i, numtotal; // index into the string
int nummaximo;
    
    nummaximo = numeros[0];
 
    numtotal = sizeof numeros / sizeof numeros[0];
    printf("##%d\n", numtotal); 
 
 
for (i = 0; numeros[i] != '\0'; ++i) {
    
    if (nummaximo <= numeros[i]) {
    nummaximo = numeros[i]; }
    printf("de momento es %d\n", nummaximo); 
        
    }
    
    

return (nummaximo);
}

int main()
{
    
    int bingo[] = {1,2,3, 4, 4, 4, 4, 4, 5, 4, 66, 3, 4, 3, 2, 67};
    int index22;
    index22 = sizeof bingo / sizeof bingo[0];
    

    printf("##total d numero s %d en bingo\n", index22); 
 
    printf("el valor maximo es %d\n", maximo(bingo));



return (0);
}

for (i = 0; numeros[i] != '\0'; ++i)

for (i = 0; i <numtotal ; ++i) {

main.cpp:29:32: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11 [enabled by default]
main.cpp:29:32: error: assigning to an array from an initializer list
main.cpp:30:37: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11 [enabled by default]
main.cpp:30:37: error: assigning to an array from an initializer list
main.cpp:32:32: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11 [enabled by default]
main.cpp:32:32: error: assigning to an array from an initializer list
main.cpp:33:37: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11 [enabled by default]
main.cpp:33:37: error: assigning to an array from an initializer list
main.cpp:38:94: error: cannot convert 'main()::horayfecha' to 'int*' for argument '1' to 'int tiemporeal(int*, int*, int*, int*)'

#include <stdio.h>
#include <stdlib.h>
#include <string.h>



// Exercise 12-2: Design a structure to store time and date. Write a function to find
// the difference between two times in minutes.

int tiemporeal(int tim1[1], int dat1[2], int tim2[1], int dat2[2]) {
    // Idea= calcular minutos desde fecha 0 para ambas fechas
    // calcular diferencia entre ellas y return valor absoluto
    int difmin=2; // valor dado para probar
    
    return (difmin);
}

int main(void)
{
    int i; 
    
   struct horayfecha {
    int timz[ ]; // Hora, minutos
    int data[];  // dia, mes y ano en digitos
    };

   struct horayfecha misfechas[1];
   
   misfechas[0].timz = { 23, 30};
   misfechas[0].data = { 1, 7, 1998 };
   
   misfechas[1].timz = { 22, 32};
   misfechas[1].data = { 2, 7, 1997 };
      
    
printf ("numero de minutos entre ambas fechas es %d\n", tiemporeal(misfechas[0], misfechas[1]) );
   

return (0);
}
  

#include <stdio.h>
#include <string.h>

int index, espacio;
char line[100];

int main()
{

strcpy(line,"hola sam, hola sam."); 
index=0;

while (line[index] != '/0') 
{
    if (line[index] == ' ') {
    ++espacio; }
    ++index;
}

   
   printf("%d palabras/n", espacio+1);


return (0);
}

Compiling the source code....
$g++ main.cpp -o demo -lm -pthread -lgmpxx -lgmp -lreadline 2>&1
main.cpp:13:23: warning: multi-character character constant [-Wmultichar]
main.cpp:4:5: error: 'int index' redeclared as different kind of symbol
In file included from main.cpp:2:0:
/usr/include/string.h:471:22: error: previous declaration of 'const char* index(const char*, int)'
main.cpp: In function 'int main()':
main.cpp:11:7: error: overloaded function with no contextual type information
main.cpp:13:18: error: invalid types 'char [100][]' for array subscript
main.cpp:15:19: error: invalid types 'char [100][]' for array subscript
main.cpp:17:7: error: no pre-increment operator for type