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#include <stdio.h>
 
int main()
{
        int output=check(4,2);
        printf("%d",result);
}
int check(int no1,int no2)
{
        if(no1>no2)
        no2=no1-10;
        no1=no2+10;
        else
        no1=no2+20;
        return no1;
}

prog.c: In function ‘main’:
prog.c:5:20: warning: implicit declaration of function ‘check’ [-Wimplicit-function-declaration]
         int output=check(4,2);
                    ^~~~~
prog.c:6:21: error: ‘result’ undeclared (first use in this function)
         printf("%d",result);
                     ^~~~~~
prog.c:6:21: note: each undeclared identifier is reported only once for each function it appears in
prog.c:5:13: warning: unused variable ‘output’ [-Wunused-variable]
         int output=check(4,2);
             ^~~~~~
prog.c: In function ‘check’:
prog.c:13:9: error: ‘else’ without a previous ‘if’
         else
         ^~~~

Standard output is empty