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#include <stdio.h>
#include <stdlib.h>
 
int main (){
int dia, mes, ano;
char data_mes, data_dia, data_ano,total_dias_mes, resultado;
printf ("Digite um dia:");
scanf ("%i", &dia);
printf ("Digite um mes:");
scanf ("%i", &mes);
printf ("Digite um ano:");
scanf ("%i", &ano);
 
if (dia>=1 && dia<=31){
data_dia = 'valida';
}
else {
data_dia = 'invalida';
}
if (mes>=1 && mes<=12){
data_mes = 'valida';
}
else {
data_mes = 'invalida';
}
if (mes=1||mes=3||mes=5||mes=7||mes=8||mes=10||mes=12){
total_dias_mes = 'O mes eh de 31 dias';
}
else if (mes=4||mes=6||mes=9||mes=11){
total_dias_mes = 'O mes eh de 30 dias';
}
else if (mes=2){
    if ((ano%4==0)&& (ano%100!=0)||(ano%400==0)){
    total_dias_mes='O ano eh bissexto e tem 29 dias';
    }
    else {
    total_dias_mes = 'O mes eh de 28 dias';
    }
}
 
if (ano>=1){
data_ano = 'valida';
}
else {
data_ano = 'invalida';
}
 
if (data_dia = 'valida' && data_mes = 'valida' && data_ano = 'valida'){
resultado = 'VALIDA';
}
else {
resultado = 'INVALIDA';
}
printf ("O dia, o mes e ano digitado forma uma data: %c", resultado);
system ("pause");
return 0;
}
 
 
 
 

prog.c:15:12: warning: character constant too long for its type
prog.c: In function ‘main’:
prog.c:15: warning: overflow in implicit constant conversion
prog.c:18:12: warning: character constant too long for its type
prog.c:18: warning: overflow in implicit constant conversion
prog.c:21:12: warning: character constant too long for its type
prog.c:21: warning: overflow in implicit constant conversion
prog.c:24:12: warning: character constant too long for its type
prog.c:24: warning: overflow in implicit constant conversion
prog.c:26: error: lvalue required as left operand of assignment
prog.c:27:18: warning: character constant too long for its type
prog.c:27: warning: overflow in implicit constant conversion
prog.c:29: error: lvalue required as left operand of assignment
prog.c:30:18: warning: character constant too long for its type
prog.c:30: warning: overflow in implicit constant conversion
prog.c:32: warning: suggest parentheses around assignment used as truth value
prog.c:33: warning: suggest parentheses around && within ||
prog.c:34:20: warning: character constant too long for its type
prog.c:34: warning: overflow in implicit constant conversion
prog.c:37:22: warning: character constant too long for its type
prog.c:37: warning: overflow in implicit constant conversion
prog.c:42:12: warning: character constant too long for its type
prog.c:42: warning: overflow in implicit constant conversion
prog.c:45:12: warning: character constant too long for its type
prog.c:45: warning: overflow in implicit constant conversion
prog.c:48:16: warning: character constant too long for its type
prog.c:48:39: warning: character constant too long for its type
prog.c:48:62: warning: character constant too long for its type
prog.c:48: error: lvalue required as left operand of assignment
prog.c:49:13: warning: character constant too long for its type
prog.c:49: warning: overflow in implicit constant conversion
prog.c:52:13: warning: character constant too long for its type
prog.c:52: warning: overflow in implicit constant conversion
prog.c:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c:12: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result
prog.c:55: warning: ignoring return value of ‘system’, declared with attribute warn_unused_result

Standard output is empty