Where was I wrong?

[kalena]

Why do I keep showing zero?

    #include <stdio.h>
#include <conio.h>
#include <math.h>
#include <stdlib.h>
int main(void)

{

float f, n;

int r = 0;

int t = 2;
printf("Vvedite n=");
scanf_s("%f", &amp;n);

if (0 &lt;= t &amp;&amp; t &lt;= 2) {
    f = 1.5 + r;
}
if (2 &lt; t &amp;&amp; t &lt; 5) {
    f = r;
}
if (5 &lt;= t &amp;&amp; t &lt;= 10) {
    f = 2 * r;
}
if (n == 1.5) {
    r = 2.5;
}
if (n == 3.4) {
    r = 1.5;
}
if (n == 2.6) {
    r = 10.5;
}
printf("f raven %d", f);
getchar();
system("pause");
return 0;

}

[charlenef]

#include <stdio.h>
#include <conio.h>
#include <math.h>
#include <stdlib.h>

int main(void)
{
    float f, n;
    int r = 0;
    int t = 1;

    printf("Vvedite n=");
    scanf_s("%f", &n);

    if (0 <= t && t <= 2) {
        f = 1.5 + r;
    }
    if (2 < t && t < 5) {
        f = r;
    }
    if (5 <= t && t <= 10) {
        f = 2 * r;
    }
    if (n == 1.5) {
        r = 2.5;
    }
    if (n == 3.4) {
        r = 1.5;
    }
    if (n == 2.6) {
        r = 10.5;
    }
    printf("f raven %f", f);
    getchar();
    system("pause");
    return 0;
}