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Introduction [cont'd]
Input Output Functions [cont'd]
Structures and Unions [cont'd]
# Preprocessor [cont'd]
stdio.h in Introduction of Programming in C
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Stdio.h - Standard Input Output 
stdio.h header file has all input and output functions to manage all streams of input and output. It has printf(), scanf(), fopen(), fclose() etc.
Program
#include
void main(){
    int a,b;
    int c;
    printf("Enter the A, B values\n");
    scanf("%d",&a);
    scanf("%d",&b);
    c = a + b;
    printf("C = %d",c);
}
Output 
Enter the A, B Values
10
20

C = 30
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