#include <stdio.h>

main()
{
int a, b, sum = 0;
int n;

printf("input : ");
scanf("%d %d", &a, &b);

if (a <= b)
for (n = a ; n <= b ; n++)
sum = sum + n;
else
for (n = b ; n <= a ; n++)
sum = sum + n;
printf("sum = %d\n", sum);
}

#include <stdio.h>

main()
{
int a, b, sum = 0;
int n;

printf("input : ");
scanf("%d %d", &a, &b);

for (n = a ; n <= b ; n++)
sum = sum + n;

printf("sum = %d\n", sum);
}

#include <stdio.h>

main()
{
int sum = 0, n = 0;
int i;

for (i = 1 ; i <= 10 ; i++)
sum = sum + i;
printf("sum = %d\n", sum);
}

#include <stdio.h>

int a, b, c, d;

void main()
{
scanf("%d %d %d", &a, &b, &c);
d = b * b - 4 * a * c;
if (d > 0)
printf("The equation %d x^2 + %d x + %d has the real roots.\n", a, b, c);
else if (d < 0)
printf("The equation %d x^2 + %d x + %d has the imaginary roots.\n", a, b, c);
else
printf("The equation %d x^2 + %d x + %d has the multiple root.\n", a, b, c);
}

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