Analog comparator TM4c123gh6pm

1. While configuring for analog comparator pin how to configure analog pin. I have used Pinmux utility to generate code. It generated code "GPIOPinConfigure(GPIO_PC7_C0-);" , byt code gives error that GPIO_PC7_C0- is not defined.

2. Page 1217, showed comp+ input pin has three pins: +ve input,+ve input (alternate),reference input. 

What is +ve input (alternate)  here. is it same as +ve input?

3. While using comparator, is it necessary to put to it output also? I dont want to consume external pin, just want to generate interrupt.

4. Below is my code, is below sequence is correct for configuring it.

void comp0_isr(void)
{
/* clear comparator int */    
    ComparatorIntClear(COMP_BASE , 0U);
    
/* toggle led */    
    RED_LED_INVERT();
    
}    




void configure_uart(void) 
{             
    uint32_t ready_count;
    
/* enable comp0 */    
    SysCtlPeripheralDisable(SYSCTL_PERIPH_COMP0);
    SysCtlPeripheralReset(SYSCTL_PERIPH_COMP0);
    SysCtlPeripheralEnable(SYSCTL_PERIPH_COMP0);
    
    ready_count = 2000U;
    while( (!(SysCtlPeripheralReady(SYSCTL_PERIPH_COMP0)))  &&  (--ready_count));
    if(0U == ready_count)   /* if periph not ready take action */
    {
    }
    
/* configure pins co-  */    
    SysCtlGPIOAHBEnable(SYSCTL_PERIPH_GPIOC);    
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);
    
    ready_count = 2000U;
    while( (!(SysCtlPeripheralReady(SYSCTL_PERIPH_GPIOC)))  &&  (--ready_count));
    if(0U == ready_count)   /* if periph not ready take action */
    {
    }    
//    GPIOPinConfigure(GPIO_PC7_C0-);
    GPIOPinTypeComparator(GPIO_PORTC_AHB_BASE, GPIO_PIN_7);

/* disable comparator int  */    
    ComparatorIntDisable(COMP_BASE , 0U);
    ComparatorIntClear(COMP_BASE , 0U);
    
/* set ref & configure comparator */    
    ComparatorRefSet(COMP_BASE , COMP_REF_2_371875V);
    ComparatorConfigure(COMP_BASE , 0U , COMP_TRIG_NONE | COMP_INT_RISE | COMP_ASRCP_REF | COMP_OUTPUT_NORMAL);
    
/* wait for 10us delay as mentioned in datasheet after configuring comprator */    
    wait_delay_us(10U);
    
/* register & enable interrupt */    
    ComparatorIntRegister(COMP_BASE , 0U , comp0_isr);
    ComparatorIntEnable(COMP_BASE , 0U);
    
    while(1);      
    
}