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#include <stdio.h>
int main {
	int x, sum=0, sump=0, prom=0, promp=0, n=1, y=2, cont=0, contt=0;
	printf("Ingrese numero /n");
	scanf("%d",&x);
	for(n=1,n<=x,n++){
		sum=sum+n;
		contt=contt+1;
		contt++
	}
	while(y<=x){
		y=y+2;
		cont=cont+1;
		cont++;
		y++;
	}
	promp=sump/cont;
	prom=sum/contt;
	printf("Promedio Total %d",prom);
	printf("Promedio Pares %d",promp);
	getchar();
	getchar();
	return 0;
}

prog.cpp:2:5: warning: extended initializer lists only available with -std=c++11 or -std=gnu++11 [enabled by default]
 int main {
     ^
prog.cpp:3:2: error: expected primary-expression before ‘int’
  int x, sum=0, sump=0, prom=0, promp=0, n=1, y=2, cont=0, contt=0;
  ^
prog.cpp:3:2: error: expected ‘}’ before ‘int’
prog.cpp:3:2: error: expected ‘,’ or ‘;’ before ‘int’
prog.cpp:4:8: error: expected constructor, destructor, or type conversion before ‘(’ token
  printf("Ingrese numero /n");
        ^
prog.cpp:5:7: error: expected constructor, destructor, or type conversion before ‘(’ token
  scanf("%d",&x);
       ^
prog.cpp:6:2: error: expected unqualified-id before ‘for’
  for(n=1,n<=x,n++){
  ^
prog.cpp:11:2: error: expected unqualified-id before ‘while’
  while(y<=x){
  ^
prog.cpp:17:2: error: ‘promp’ does not name a type
  promp=sump/cont;
  ^
prog.cpp:18:2: error: ‘prom’ does not name a type
  prom=sum/contt;
  ^
prog.cpp:19:8: error: expected constructor, destructor, or type conversion before ‘(’ token
  printf("Promedio Total %d",prom);
        ^
prog.cpp:20:8: error: expected constructor, destructor, or type conversion before ‘(’ token
  printf("Promedio Pares %d",promp);
        ^
prog.cpp:21:11: error: expected constructor, destructor, or type conversion before ‘;’ token
  getchar();
           ^
prog.cpp:22:11: error: expected constructor, destructor, or type conversion before ‘;’ token
  getchar();
           ^
prog.cpp:23:2: error: expected unqualified-id before ‘return’
  return 0;
  ^
prog.cpp:24:1: error: expected declaration before ‘}’ token
 }
 ^

Standard output is empty