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Golang Conversions | Find Output Programs | Set 1

This section contains the Golang conversions find output programs (set 1) with their output and explanations.
Submitted by Nidhi, on October 21, 2021

Program 1:

package main

import "fmt"
import "strconv"

func main() {
	var str1 string = "123"
	var str2 string = "abc"
	var num int64

	num, _ = strconv.ParseInt(str1, 0, 64)
	fmt.Println("Num : ", num)

	num, _ = strconv.ParseInt(str2, 0, 64)
	fmt.Println("Num : ", num)
}

Output:

Num :  123
Num :  0

Explanation:

In the main() function, we created two string variables. Then we converted the created strings into numbers using ParseInt() function. The ParseInt() returns 0 if the given string does not contain a number. After that, we printed the result.

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Program 2:

package main

import "fmt"
import "strconv"

func main() {
	var str1 string = "123"
	var str2 string = "456"

	var ptr *string
	var num int64

	ptr = &str1
	num, _ = strconv.ParseInt(*ptr, 0, 64)
	fmt.Println("Num : ", num)

	ptr = &str2
	num, _ = strconv.ParseInt(*ptr, 0, 64)
	fmt.Println("Num : ", num)
}

Output:

Num :  123
Num :  456

Explanation:

In the main() function, we created two string variables and a pointer to the string. Then we converted the created strings into numbers with pointer using ParseInt() function. The ParseInt() returns 0 if the given string does not contain a number. After that, we printed the result.

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Program 3:

package main

import "fmt"

func main() {
	var str1 string = "123"
	var str2 string = "456"
	var num int64

	num, _ = int64(str1)
	fmt.Println("Num : ", num)

	num, _ = int64(str2)
	fmt.Println("Num : ", num)
}

Output:

./prog.go:10:9: assignment mismatch: 2 variables but 1 value
./prog.go:10:16: cannot convert str1 (type string) to type int64
./prog.go:13:9: assignment mismatch: 2 variables but 1 value
./prog.go:13:16: cannot convert str2 (type string) to type int64

Explanation:

The above program will generate syntax errors because we cannot convert the string into an integer using the int64() function.

---

Program 4:

package main

import "fmt"

func main() {
	var num1 float64 = 123.45
	var num2 float64 = 456.12
	var ptr *float64
	var num int64

	ptr = &num1
	num = int64(*ptr)
	fmt.Println("Num1 : ", num)

	ptr = &num2
	num = int64(*ptr)
	fmt.Println("Num2 : ", num)
}

Output:

Num1 :  123
Num2 :  456

Explanation:

In the main() function, we created two float variables and a pointer to float. Then we converted the created float numbers into integer numbers with pointer using int64() function. After that, we printed the result.

---

Program 5:

package main

import "fmt"

func main() {
	var num1 float64 = 123.45
	var num2 float64 = -456.12
	var ptr *float64
	var num int64

	ptr = &num1
	num = byte(*ptr)
	fmt.Println("Num1 : ", num)

	ptr = &num2
	num = byte(*ptr)
	fmt.Println("Num2 : ", num)
}

Output:

./prog.go:12:6: cannot use byte(*ptr) (type byte) as type int64 in assignment
./prog.go:16:6: cannot use byte(*ptr) (type byte) as type int64 in assignment

Explanation:

The above program will generate syntax errors. Because byte() function returns byte value after conversion but here we tried to assign byte value into an integer.

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