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C - Check that an int read by scanf is in the range of the integers
int e_1;
char c[1];
// noNeedToCleanBuffer is used to avoid buffer cleaning the first time.
int noNeedToCleanBuffer = 1;
do {
    // Clears the buffer.
    if (!noNeedToCleanBuffer)
        while ((c[0] = getchar()) != 'n') ;

    noNeedToCleanBuffer = 0;
    printf("Input an integer value: n");
    e_1 = scanf("%d", &n);

    c[0] = getchar();
} while ((e_1 != 1 && c[0] != 10) || (e_1 == 1 && c[0] != 10));

num = INT_MAX;
i = 0;

while(num != 0){
    str[i] = num % 10;
    num = num / 10;
    i++;
}

int foo = /* some value to test */;
long bar = (long)foo;

if ( (bar < (long)INT_MIN) || (bar > (long)INT_MAX) ) return false;