Set Specific Bits in a 32-bit Register

Code

#include <stdio.h>
#include <stdint.h>

/*
uint32_t set_bits(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    //First of all to set a bit we need OR
    //To set consecutive bits 
    uint32_t temp = 0;

    for (uint8_t i =0 ; i<len ; i++)
    {
        temp  +=  (1<<(pos+i));
    }

    reg  = reg | temp;
    return reg;
}
*/
/*
uint32_t set_bits(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    //First of all to set a bit we need OR
    //To set consecutive bits 

    for (uint8_t i =0 ; i<len ; i++)  //much simpler but failing case 5
    {
        reg  +=  (uint32_t)(1<<(pos+i));
    }
    return reg;
}
*/

//Better way to do this without using the FOR loop:


uint32_t set_bits(uint32_t reg, uint8_t pos, uint8_t len) {
    // Your code here
    
    uint32_t temp = 0;
    
    temp |= ((1<<(len)) - 1u);  //The most simplest of all if you want to set consecutive bits
    temp = temp << pos;
    reg  |= temp;

    
    return reg;
}
int main() {
    uint32_t reg;
    uint8_t pos, len;
    scanf("%u %hhu %hhu", &reg, &pos, &len);
    printf("%u", set_bits(reg, pos, len));
    return 0;
}

Solving Approach