#include <stdio.h>

#include <limits.h>

#define V 6 
int minDistance(int dist[], int sptSet[]) {
 int min = INT_MAX, min_index;
 for (int v = 0; v < V; v++) {
 if (sptSet[v] == 0 && dist[v] <= min) {
 min = dist[v];
 min_index = v;
 }
 }
 return min_index;
}
void printSolution(int dist[]) {
 printf("Vertex \t Distance from Source\n");
 for (int i = 0; i < V; i++)
 printf("%d \t %d\n", i, dist[i]);
}
void dijkstra(int graph[V][V], int src) {
  int dist[V]; 
 int sptSet[V]; 
 for (int i = 0; i < V; i++) {
 dist[i] = INT_MAX;
 sptSet[i] = 0;
 }
 dist[src] = 0;
 for (int count = 0; count < V - 1; count++) {
 int u = minDistance(dist, sptSet);
 sptSet[u] = 1;
 for (int v = 0; v < V; v++) {
 if (!sptSet[v] && graph[u][v] && dist[u] != INT_MAX && dist[u] + graph[u][v] < dist[v]) {
 dist[v] = dist[u] + graph[u][v];
 }
 }
 }
 printSolution(dist);
}
int main(){
 int graph[V][V] = {{0, 1, 4, 0, 0, 0},
 {0, 0, 2, 7, 0, 0},
 {0, 0, 0, 0, 3, 0},
 {0, 0, 0, 0, 0, 2},
 {0, 0, 0, 0, 0, 5},
 {0, 0, 0, 0, 0, 0}};
 int source = 0; // Source vertex
 printf("Shortest distances from source vertex %d:\n", source);
 dijkstra(graph, source);
 return 0;
}
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#include <stdio.h>
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    return 0;
    
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About C

C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.

Key features:

  • Structured Programming
  • Popular system programming language
  • UNIX, MySQL and Oracle are completely written in C.
  • Supports variety of platforms
  • Efficient and also handle low-level activities.
  • As fast as assembly language and hence used as system development language.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition if-else is used.

if(conditional-expression) {
   // code
} else {
   // code
}

You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to if-else-if ladder.

switch(conditional-expression) {    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
...    
    
default:     
 // code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  // code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while(condition) {  
 // code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {
  // code 
} while (condition);

Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.

Syntax

One dimentional Array:

data-type array-name[size];

Two dimensional array:

data-type array-name[size][size];

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

Two types of functions are present in C

  1. Library Functions:

Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,

  1. User defined functions:

User defined functions are the ones which are written by the programmer based on the requirement.

How to declare a Function

return_type function_name(parameters);

How to call a Function

function_name (parameters)

How to define a Function

return_type function_name(parameters) {  
  //code
}