What am I doing wrong with "scanf" ?

Marvee Amasi · 2024-07-30T14:14:27.358Z

When I compiled my `actuat_so` assembly file's code using ``` nasm -f elf64 example.asm -o example.o gcc -no-pie -m64 example.o -o example``` and then run ``` ./example``` it runs good and print: ```enter a number: ``` but then crashes and prints: ``` Segmentation fault (core dumped)``` That means `printf` works just fine but `scanf` is not . What am I doing wrong with `scanf` then?

When I compiled my

actuat_so

actuat_so

actuat_so

actuat_so assembly file's code using

 nasm -f elf64 example.asm -o example.o
gcc -no-pie -m64 example.o -o example

 nasm -f elf64 example.asm -o example.o
gcc -no-pie -m64 example.o -o example

 nasm -f elf64 example.asm -o example.o
gcc -no-pie -m64 example.o -o example

 nasm -f elf64 example.asm -o example.o
gcc -no-pie -m64 example.o -o example

and then run

 ./example

 ./example

 ./example

 ./example

it runs good and print:

enter a number:

enter a number:

enter a number:

enter a number:

but then crashes and prints:

 Segmentation fault (core dumped)

 Segmentation fault (core dumped)

 Segmentation fault (core dumped)

 Segmentation fault (core dumped)

That means

printf

printf

printf

printf works just fine but

scanf

scanf

scanf

scanf is not . What am I doing wrong with

scanf

scanf

scanf

scanf then?

Solution

Troubleshooting Steps:

1) Verify that scanf is linked correctly and the assembly code matches the calling convention.
2) Ensure that you are aligning the stack properly before calling scanf.
3) Check if printf or other functions in your code are causing issues indirectly.

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What am I doing wrong with "scanf" ?

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