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void solve(int num1, int num2) {
      /* write your solution here */
    int sum;
    scanf("%d",&sum);
    sum=num1+num2;
    printf("%d",sum);
}

prog.c: In function ‘solve’:
prog.c:4:5: warning: implicit declaration of function ‘scanf’ [-Wimplicit-function-declaration]
     scanf("%d",&sum);
     ^~~~~
prog.c:4:5: warning: incompatible implicit declaration of built-in function ‘scanf’
prog.c:4:5: note: include ‘<stdio.h>’ or provide a declaration of ‘scanf’
prog.c:1:1:
+#include <stdio.h>
 void solve(int num1, int num2) {
prog.c:4:5:
     scanf("%d",&sum);
     ^~~~~
prog.c:6:5: warning: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]
     printf("%d",sum);
     ^~~~~~
prog.c:6:5: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:6:5: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status

Standard output is empty